Document:

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                                                                   Exhibit 10.42

                                                                  EXECUTION COPY

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                          REGISTRATION RIGHTS AGREEMENT

                                      AMONG

                             HORIZON OFFSHORE, INC.

                                       AND

                            THE PURCHASERS LISTED ON
                           THE SIGNATURE PAGES HEREOF

                           Dated as of March 11, 2004

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                                TABLE OF CONTENTS

                                                                            Page

SECTION 1.    Definitions.....................................................1
SECTION 2.    Registration of Securities by the Company.......................4
SECTION 3.    Registration Expenses..........................................11
SECTION 4.    Conditions to Registration.....................................12
SECTION 5.    Indemnification................................................12
SECTION 6.    Exchange Act Registration; Rule 144 Reporting..................15
SECTION 7.    Limitation on Registration Rights of Others....................16
SECTION 8.    Mergers, etc...................................................17
SECTION 9.    Notices, etc...................................................17
SECTION 10.   Entire Agreement...............................................17
SECTION 11.   Amendments; Waivers and Further Agreements.....................17
SECTION 12.   Assignment; Successors and Assigns.............................18
SECTION 13.   Severability...................................................18
SECTION 14.   Counterparts...................................................19
SECTION 15.   Gender; Usage..................................................19
SECTION 16.   Governing Law..................................................19
SECTION 17.   Survival.......................................................19
SECTION 18.   Expenses.......................................................19
SECTION 19.   Specific Performance...........................................19

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                                                                  EXECUTION COPY

                          REGISTRATION RIGHTS AGREEMENT

     THIS REGISTRATION RIGHTS AGREEMENT (this "Agreement") is made and entered
into as of March 11, 2004 by and among HORIZON OFFSHORE, INC., a Delaware
corporation (the "Company"), and the purchasers listed on the signature pages
hereof (collectively, the "Purchasers").

                                   WITNESSETH:

RECITALS.

     A. The Company, Highwood Partners, L.P. and Westgate International, L.P.
have previously entered into a Registration Rights Agreement dated as of
December 4, 1997. Such agreement is being amended as of the date hereof (as
amended from time to time, the "1997 Registration Rights Agreement").

     B. Simultaneously herewith, the Purchasers are entering into the Purchase
Agreement (as defined in Section 1), pursuant to which, among other things, the
Purchasers have agreed, upon the terms and subject to the conditions set forth
therein, to purchase the Warrants (as defined in Section 1); and

     C. It is a condition precedent to the purchase of the Warrants that the
Company execute and deliver this Agreement; and

     D. The Purchasers are unwilling to purchase the Warrants pursuant to the
Purchase Agreement unless they receive the assurances set forth in this
Agreement;

     NOW, THEREFORE, in consideration of the recitals, of the Purchasers
proceeding with the consummation of the transactions contemplated by the
Purchase Agreement, and the mutual covenants hereinafter set forth, the parties,
intending to be legally bound, hereby agree as follows:

                            SECTION 1. Definitions.

          (a) Defined Terms. The following terms (whether or not underscored)
when used in this Agreement, including its preamble and recitals, shall, except
where the context otherwise requires, have the following meanings (such meanings
to be equally applicable to the singular and plural forms thereof):

     "1997 Registration Rights Agreement" is defined in the recitals.

     "Agreement" means this Registration Rights Agreement as in effect on the
date hereof and as hereafter amended, supplemented, restated or otherwise
modified.

     "Available Securities" is defined in Section 2(a).
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     "Business Day" means any day which is neither a Saturday, a Sunday nor a
legal holiday on which banks are authorized or required to be closed in New
York, New York.

     "Common Stock" means the Common Stock, par value $1.00 per share, of the
Company.

     "Company" is defined in the Preamble.

     "Exchange Act" means the Securities Exchange Act of 1934, as amended from
time to time.

     "Holders" means, collectively, the registered holders (including,
initially, the Purchasers), from time to time, of Warrant Securities. Whenever
the phrase "Holder of Registrable Securities" or any similar phrase is used
herein, it shall also include any holders of the Warrants.

     "Indemnified Person" is defined in Section 5(a).

     "Indemnifying Person" is defined in Section 5(c).

     "Initial Request" is defined in Section 2(b).

     "Initial Requesting Holders" is defined in Section 2(b).

     "NASD" means the National Association of Securities Dealers, Inc.

     "Person" means any natural person, corporation, partnership, limited
liability company, firm, association, government, governmental agency or any
other entity, whether acting in an individual, fiduciary or other capacity.

     "Prospectus" means each prospectus included as part of any Registration
Statement, as amended or supplemented, including each preliminary prospectus and
all material incorporated by reference in such prospectus.

     "Purchase Agreement" means the Purchase Agreement, dated of even date
herewith, by and between the Purchasers, the Company, Horizon Vessels, Inc., a
Delaware corporation, Horizon Offshore Contractors, Inc., a Delaware
corporation, Horizon Subsea Services, Inc., a Delaware corporation, Horizon
Vessels International Ltd., a Cayman exempted limited liability company,
HorizEn, LLC, a Delaware limited liability company, ECH Offshore, S. de R.L. de
C.V., a Mexican limited liability company, and HOC Offshore, S. de R.L. de C.V.,
a Mexican limited liability company, as in effect on the date hereof and as
hereafter amended, supplemented, restated or otherwise modified.

     "Purchasers" is defined in the Preamble.

     "Registrable Securities" means the Warrant Shares issued upon exercise or
conversion of any Warrants, but excluding (i) shares that have been disposed of
under a Registration Statement or any other effective registration statement,
including in a transaction contemplated by Section 8, and (ii) shares sold
pursuant to Rule 144 under the Securities Act.

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     "Registration Expenses" is defined in Section 3(c).

     "Registration Request" is defined in Section 2(a).

     "Registration Statement" means any registration statement of the Company
which covers Registrable Securities pursuant to Section 2 of this Agreement,
including the Prospectus, amendments (including post-effective amendments) and
supplements to such registration statement and Prospectus and all exhibits and
all material incorporated by reference in such registration statement.

     "Required Holders" means the Holders of Warrant Securities which when fully
exercised or converted would represent at least two-thirds of the voting power
of the Warrant Securities held by all of the Holders. The "Required Holders" of
any subset of the Warrant Securities (or the Registrable Securities) shall mean
the Holders of Warrant Securities which when fully exercised or converted would
represent at least two-thirds of the voting power of such subset of the Warrant
Securities (or Registrable Securities).

     "SEC" means the United States Securities and Exchange Commission.

     "Secondary Request" is defined in Section 2(b).

     "Securities Act" means the Securities Act of 1933, as amended from time to
time.

     "Specified Registrable Securities" is defined in Section 2(a).

     "Stock" means any capital stock of the Company.

     "Warrant Securities" means, collectively, the Warrants and the Warrant
Shares.

     "Warrant Shares" means the securities which a Holder may acquire upon
exercise or conversion of a Warrant, together with any other securities which
such Holder may acquire on account of any such Warrant Shares whether upon the
making or paying of any dividend or other distribution on Common Stock, upon any
split up of such Common Stock, upon a recapitalization, merger, consolidation,
share exchange, reorganization or other transaction or series of related
transactions in which shares of Common Stock are changed into or exchanged for
securities of another corporation, upon exercise of any preemptive right (or the
exercise or conversion of any security which such Holder may acquire in
connection with the exercise of any preemptive right) with respect to any such
Common Stock or otherwise.

     "Warrants" means the warrants to purchase an aggregate of 5,283,300 shares
(subject to adjustment) of Common Stock for an initial Remaining Exercise Price
(as defined in the Purchase Agreement) of $0.01 per share, together with any
warrants issued in substitution therefor or replacement thereof.

     (b) Cross-References; Headings. Unless otherwise specified, references in
this Agreement to any Article or Section are references to such Article or
Section of this Agreement, and unless otherwise specified, references in any
Article, Section or definition to any clause are references to such clause of
such Section, Article or definition. The headings

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contained in this Agreement are for reference purposes only and shall not in any
way affect the meaning or interpretation of this Agreement.

              SECTION 2. Registration of Securities by the Company.

          (a) Piggyback Registration. If at any time or from time to time the
Company shall propose to file on its behalf or on behalf of any of its security
holders a registration statement under the Securities Act on Form S-1, S-2 or
S-3 (or on any other form for the general registration of securities) with
respect to the class of securities represented by the Warrant Shares, the
Company shall in each case:

               (i) promptly give written notice to each Holder at least thirty
     (30) days before the anticipated filing date, indicating the proposed
     offering price and describing the plan of distribution;

               (ii) include in such registration (and any related qualification
     under blue sky or other state securities laws or other compliance) and, at
     the request of any Holder, in any underwriting involved therein (and with
     respect to any offering pursuant to the 1997 Registration Rights
     Agreement), all the Registrable Securities specified by any Holder or
     Holders of Registrable Securities (the "Specified Registrable Securities")
     in a written request (the "Registration Request") delivered to the Company
     within twenty (20) days after receipt of such written notice from the
     Company; and

               (iii) if such offering is proposed to be underwritten, use its
     best efforts to cause the managing underwriter(s) of such proposed
     underwritten offering to permit the Specified Registrable Securities to be
     included in the Registration Statement for such offering on the same terms
     and conditions as any similar securities of the Company included therein.

Notwithstanding the foregoing, if the managing underwriter(s) of such an
underwritten offering advise(s) the Holders of Specified Registrable Securities
in writing that marketing considerations require a limitation on the securities,
other than the securities the Company intends to sell, to be included in any
Registration Statement filed under this Section 2 to a certain number of shares
(the "Available Securities"), then the Company shall in such case be obligated
to such Holders only with respect to such number of Available Securities;
provided that with respect to cutbacks in connection with an offering pursuant
to the 1997 Registration Rights Agreement, the Holders shall be treated on a
pari passu basis with Holders under the 1997 Registration Rights Agreement. The
limitation on the number of Specified Registrable Securities will be imposed pro
rata (based upon the ratio of the number of shares of Specified Registrable
Securities which the managing underwriter(s) propose(s) to include at the
anticipated offering price to the number of Specified Registrable Securities
owned by each Holder) among all Holders of Specified Registrable Securities.

     Each Registration Request shall set forth the number or amount of Specified
Registrable Securities. Except as provided by Section 2(b), notwithstanding any
other provision of this Agreement to the contrary, neither the delivery of the
notice by the Company nor of the Registration Request by any Holder shall in any
way obligate the Company to file a Registration

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Statement and, notwithstanding such filing, the Company may, at any time prior
to the effective date thereof, in its sole discretion, determine not to offer
the securities to which the Registration Statement relates without liability to
any of the Holders. No registration of Registrable Securities effected under
this Section 2(a) shall relieve the Company of its obligation to effect the
registration of Registrable Securities pursuant to Section 2(b).

          (b) Registration at Holder's Request. Upon the written request (an
"Initial Request") of one or more Holders (the "Initial Requesting Holders") of
Warrant Securities constituting 25% or more of all Warrant Securities then
outstanding made at any time requesting that the Company effect the registration
under the Securities Act of all or part of the Registrable Securities held by
such Holders and specifying the intended method or methods of disposition of
such Registrable Securities, the Company will give prompt (and in any case
within ten (10) days) written notice of such requested registration and the
intended method or methods of disposition thereof to all Holders of Warrant
Securities and thereupon will expeditiously prepare and file a Registration
Statement with respect to, and use its best efforts to effect the registration
under the Securities Act, of:

               (i) the Registrable Securities which the Company has been so
     requested to register by the Initial Requesting Holders, for disposition in
     accordance with the intended method of disposition stated in such request,
     and

               (ii) all other Registrable Securities which the Company has been
     requested to register by the Holders of Warrant Securities by written
     request (a "Secondary Request") delivered to the Company within twenty (20)
     days after receipt of such written notice from the Company.

     In any case where the Initial Requesting Holders specify that the intended
method of disposition is to be an underwritten offering, the underwriter(s) for
such offering shall be selected by the Company and shall be reasonably
acceptable to the Initial Requesting Holders. Each registration requested
pursuant to this Section 2(b) shall be effected by the filing of a Registration
Statement on Form S-1, S-2 or S-3 (or on any other form for the general
registration of securities) unless the use of a different form has been agreed
upon in writing by the Company and the Initial Requesting Holders. The Company
shall be obligated to cause a Registration Statement to be filed pursuant to the
provisions of this Section 2(b) and to become effective under the Securities Act
only three times with respect to one or more Initial Requesting Holders under
this Section 2(b), provided, however, that the Company shall not be deemed to
have caused a Registration Statement to be so filed and effective, and the
Initial Requesting Holders shall not be deemed to have made such request, (1)
unless a Registration Statement covering all Registrable Securities requested to
be registered for sale in accordance with the method or methods of disposition
specified shall have become effective or (2) if, after such Registration
Statement has become effective, it is interfered with by any stop order,
injunction or other order or requirement of the SEC, any other governmental
agency or any court. The parties hereto agree that the Company shall be deemed
to have been given an Initial Request by all Holders (and the period for giving
a Secondary Request with respect thereto shall be deemed to have expired) on the
date hereof with respect to a resale shelf registration statement covering the
resale of all Warrant Shares from time to time. Whenever a registration
requested by one or more Holders pursuant to this Section 2(b) is for an
underwritten offering, unless the underwriter(s) of an

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underwritten offering object(s), the Company may include securities for offering
by the Company or any other securityholders in such Registration Statement, it
being understood that the Company's right and such other securityholders' right
to inclusion shall be subordinate to, and not pari passu with, the rights of the
Holders under this Section 2(b). If the managing underwriter(s) of any such
underwritten offering advise(s) the Holders proposing to sell Registrable
Securities in writing that marketing considerations require a limitation on the
securities to be included in any Registration Statement filed under this Section
2 to a certain number of shares, then such Holders shall share pro rata in the
number of Registrable Securities to be included in such underwritten offering,
such sharing to be based on the respective numbers of Warrant Securities owned
by such Holders and proposed to be included in such Registration Statement. From
the date of receipt of a notice from requesting Holders pursuant to this Section
2(b) indicating that such Holders intend to sell securities in an underwritten
offering until the completion of the period of distribution of the registration
contemplated thereby, the Company will not effect any other registration of its
Stock (whether for its account or that of any other securityholder).

          (c) Registration Procedures. If and when the Company shall be required
by the provisions of this Section 2 to effect the registration of Registrable
Securities under the Securities Act, the Company will use its best efforts to
effect such registration to permit the sale of such Registrable Securities in
accordance with the intended method or methods of disposition thereof, and
pursuant thereto it will, as expeditiously as possible:

               (i) before filing a Registration Statement or Prospectus or any
     amendments or supplements thereto, furnish to the Holders of the
     Registrable Securities covered by such Registration Statement and the
     underwriter(s), if any, copies of all such documents proposed to be filed,
     which documents will be made available, on a timely basis, for review by
     such Holders and underwriters;

               (ii) prepare and, as expeditiously as possible but in any event
     within 30 days (60 days in the case of an underwritten offering) after the
     end of the applicable period within which requests for registration may be
     given to the Company pursuant to this Section 2, file with the SEC a
     Registration Statement and Prospectus covering such Registrable Securities;
     prepare and file such amendments and post-effective amendments to any
     Registration Statement, and such supplements to the Prospectus, as may be
     reasonably requested by any Holder of Registrable Securities or the
     managing underwriter(s), if any, or as may be required by the Securities
     Act, the Exchange Act or by the rules, regulations or instructions
     applicable to the registration form utilized by the Company or as may
     otherwise be necessary to cause such Registration Statement to become
     effective or to keep such Registration Statement effective until such time
     as all of the Registrable Securities covered by such Registration Statement
     have been disposed of in accordance with the intended method or methods of
     disposition set forth in such Registration Statement or Prospectus; and
     cause the Prospectus as so supplemented to be filed pursuant to Rule 424
     (or any successor rule) under the Securities Act; and comply with the
     provisions of the Securities Act with respect to the disposition of all
     securities covered by such Registration Statement during the applicable
     period in accordance with the intended method or methods of disposition by
     the Holders thereof set forth in such Registration Statement or Prospectus;

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               (iii) promptly notify the selling Holders of Registrable
     Securities and the managing underwriter(s), if any, and if requested by any
     such Person, confirm such advice in writing:

                    (a) of the filing of the Prospectus or any supplement to the
               Prospectus and of the effectiveness of the Registration Statement
               and/or any post-effective amendment,

                    (b) of any request by the SEC for amendments or supplements
               to the Registration Statement or the Prospectus or for additional
               information,

                    (c) of the issuance by the SEC of any stop order suspending
               the effectiveness of the Registration Statement or the initiation
               of any proceedings for that purpose,

                    (d) of the Company's becoming aware at any time that the
               representations and warranties of the Company contemplated by
               paragraph (xiv)(a) below have ceased to be true and correct,

                    (e) of the receipt by the Company of any notification with
               respect to the suspension of the qualification of the Registrable
               Securities for sale in any jurisdiction or the initiation or
               threat of any proceeding for such purpose, and

                    (f) of the existence of any fact which, to the knowledge of
               the Company, results in the Registration Statement, the
               Prospectus or any document incorporated therein by reference
               containing an untrue statement of material fact or omitting to
               state a material fact required to be stated therein or necessary
               to make the statements therein not misleading,

               (iv) make every reasonable effort to obtain the withdrawal of any
     order suspending the effectiveness of the Registration Statement or any
     qualification referred to in paragraph (iii)(e) at the earliest possible
     moment;

               (v) if reasonably requested by the managing underwriter(s) or the
     Required Holders of the Registrable Securities being sold in connection
     with an underwritten offering, immediately incorporate in a supplement to
     the Prospectus or post-effective amendment to the Registration Statement
     such information as the managing underwriter(s) or the Required Holders of
     the Registrable Securities being sold reasonably request to have included
     therein relating to the plan of distribution with respect to such
     Registrable Securities, including, without limitation, information with
     respect to the amount of Registrable Securities being sold to such
     underwriters, the purchase price being paid therefor by such underwriters
     and any other terms of the underwritten offering of the Registrable
     Securities to be sold in such offering; and make all required filings of
     such supplement to the Prospectus or post effective amendment to the
     Registration Statement as soon as notified of the matters to be
     incorporated in such supplement to the Prospectus or post-effective
     amendment to the Registration Statement;

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               (vi) at the request of any selling Holder of Registrable
     Securities, furnish to such selling Holder of Registrable Securities and
     the managing underwriter(s), if any, without charge, at least one signed
     copy of the Registration Statement and any post-effective amendment
     thereto, including financial statements and schedules, all documents
     incorporated therein by reference and all exhibits thereto (including those
     incorporated by reference);

               (vii) deliver to each selling Holder of Registrable Securities
     and the managing underwriter(s), if any, without charge, as many copies of
     the Registration Statement, each Prospectus (including each preliminary
     prospectus) and any amendment or supplement thereto (in each case including
     all exhibits), as such Persons may reasonably request, together with all
     documents incorporated by reference in such Registration Statement or
     Prospectus, and such other documents as such selling Holder may reasonably
     request in order to facilitate the disposition of its Registrable
     Securities covered by such Registration Statement; the Company consents to
     the use of each Prospectus and any supplement thereto by each of the
     selling Holders of Registrable Securities and the managing underwriter(s),
     if any, in connection with the offering and sale of the Registrable
     Securities covered by each Prospectus or any supplement thereto;

               (viii) prior to any public offering of Registrable Securities,
     register or qualify or reasonably cooperate with the selling Holders of
     Registrable Securities, the managing underwriter(s), if any, and their
     respective counsel in connection with the registration or qualification of
     such Registrable Securities for offer and sale under the securities or blue
     sky laws of such jurisdictions as any selling Holder or managing
     underwriter(s) reasonably request(s) and do any and all other acts or
     things necessary to enable the disposition in such jurisdictions of the
     Registrable Securities covered by the Registration Statement;

               (ix) cooperate with the selling Holders of Registrable Securities
     and the managing underwriter(s), if any, to facilitate the timely
     preparation and delivery of certificates representing Registrable
     Securities to be sold and not bearing any legends restricting the transfer
     thereof; and enable such Registrable Securities to be in such denominations
     and registered in such names as the managing underwriters may request at
     least two Business Days prior to any sale of Registrable Securities to the
     underwriters;

               (x) use its best efforts to cause the Registrable Securities
     covered by the applicable Registration Statement to be registered with or
     approved by such United States, state and local governmental agencies or
     authorities as may be necessary to enable the seller or sellers thereof or
     the underwriters, if any, to consummate the disposition of such Registrable
     Securities;

               (xi) if any fact contemplated by paragraph (iii)(b) or (iii)(f)
     above shall exist, promptly notify each Holder on whose behalf Registrable
     Securities have been registered and promptly prepare and furnish to such
     Holders a supplement or post-effective amendment to the Registration
     Statement or the related Prospectus or any document incorporated therein by
     reference and promptly file any other required document so that, as
     thereafter delivered to the purchasers of the Registrable Securities,

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     neither the Registration Statement nor the Prospectus will contain an
     untrue statement of a material fact or omit to state any material fact
     required to be stated therein or necessary to make the statements therein
     not misleading; provided that if the Company shall furnish to the
     Requesting Holders a certificate signed by the Company's Chairman of the
     Board stating that in his good faith judgment such actions would be
     detrimental or otherwise disadvantageous to the Company or its
     stockholders, the Company may delay such actions for as short a period as
     reasonably necessary to remove such detrimental condition, not to exceed 30
     days in any instance.

               (xii) cause all Registrable Securities covered by the
     Registration Statement to be (A) listed on each securities exchange on
     which securities of the same class are then listed or (B) admitted for
     trading in any inter-dealer quotation system on which securities of the
     same class are then traded;

               (xiii) not later than the effective date of the applicable
     Registration Statement, provide a CUSIP number for all Registrable
     Securities covered by the Registration Statement and provide the applicable
     transfer agent with printed certificates for such Registrable Securities
     which are in a form eligible for deposit with The Depository Trust Company;

               (xiv) enter into customary agreements (including underwriting
     agreements) and take all other reasonable actions in order to expedite or
     facilitate the disposition of such Registrable Securities; and in such
     connection, except as otherwise provided:

                    (a) in an underwritten offering, make such representations
               and warranties to the Holders selling such Registrable Securities
               and the underwriters, in form, substance and scope as are
               customarily made by issuers to selling securityholders and
               underwriters in similar underwritten offerings;

                    (b) obtain opinions of counsel to the Company and updates
               thereof addressed to each selling Holder and the underwriters, if
               any, covering the matters customarily covered in opinions
               requested in similar underwritten offerings and such other
               matters as may be reasonably requested by such Holders and
               underwriters, which counsel and opinions shall be reasonably
               satisfactory (in form, scope and substance) to the managing
               underwriters, if any, and the Required Holders of the Registrable
               Securities being sold;

                    (c) in connection with any underwritten offering, obtain so
               called "cold comfort" letters and updates thereof from the
               Company's independent certified public accountants addressed to
               the selling Holders of Registrable Securities and the
               underwriters, such letters to be in customary form and covering
               matters of the type customarily covered in "cold comfort" letters
               to underwriters in connection with similar underwritten
               offerings;

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                    (d) if an underwriting agreement is entered into, cause the
               same to include indemnification and contribution provisions and
               procedures substantially similar to those set forth in Section 5,
               subject to revisions the underwriters shall reasonably request,
               with respect to all parties to be indemnified pursuant to said
               Section 5; and

                    (e) deliver such documents and certificates as may
               reasonably be requested by the Required Holders of the
               Registrable Securities being sold, or the managing
               underwriter(s), if any, to evidence compliance with this
               paragraph (xiv) and with any customary conditions contained in
               the underwriting agreement or other agreement entered into by the
               Company;

     the foregoing to be done upon each closing under any underwriting or
     similar agreement as and to the extent required thereunder and from time to
     time as may reasonably be requested by any selling Holder of Registrable
     Securities in connection with the disposition of Registrable Securities
     pursuant to such Registration Statement, all in a manner consistent with
     customary industry practice;

               (xv) upon execution and delivery of such confidentiality
     agreements as the Company may reasonably request, make available to the
     Holders of the Registrable Securities being sold, any underwriter
     participating in any disposition pursuant to such Registration Statement,
     and any attorney or accountant retained by such Holders or underwriter, all
     financial and other records, pertinent corporate documents and properties
     of the Company, and cause the Company's officers, directors and employees
     to supply all information reasonably requested by any such Holder,
     underwriter, attorney or accountant in connection with the registration, at
     such time or times as the Person requesting such information shall
     reasonably determine;

               (xvi) otherwise use its best efforts to comply with the
     Securities Act, the Exchange Act, all applicable rules and regulations of
     the SEC and all applicable state blue sky and other securities laws, rules
     and regulations, and make generally available to its security holders an
     earnings statement satisfying the provisions of Section 11(a) of the
     Securities Act, as soon as practicable, but in no event later than thirty
     (30) days after the end of the 12 calendar month period commencing after
     the effective date of the Registration Statement;

               (xvii) cooperate and assist in any filings required to be made
     with the NASD and in the performance of any due diligence investigation by
     any underwriter; and

               (xviii) prior to the filing of any document which is being
     prepared for incorporation by reference into the Registration Statement or
     the Prospectus (other than a Registration Statement or Prospectus relating
     to a "shelf" offering) , upon receipt of such confidentiality agreements as
     the Company may reasonably request, provide copies of such document to
     counsel to the selling Holders of Registrable Securities, and to the
     managing underwriter(s), if any, and make the Company's representatives
     available for discussion of such document.

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                       SECTION 3. Registration Expenses.

          (a) All expenses incident to the Company's performance of or
compliance with its obligations under this Agreement (excluding underwriting
discounts, selling commissions and brokerage fees, which will be paid by the
selling Holders) will be paid by the Company, regardless of whether Registrable
Securities are sold pursuant to any Registration Statement, including, without
limitation:

               (i) all registration, filing and listing fees;

               (ii) fees and expenses of compliance with securities or blue sky
     laws (including, without limitation, the fees and disbursements of counsel
     for the underwriters, if any, or selling Holders in connection with blue
     sky and state securities qualifications of Registrable Securities and
     determination of their eligibility for investment under the laws of such
     jurisdictions as the managing underwriter(s), if any, or the Required
     Holders of the Registrable Securities covered by such Registration
     Statement may reasonably designate);

               (iii) printing (including, without limitation, expenses of
     printing or engraving certificates for the Registrable Securities in a form
     eligible for deposit with The Depository Trust Company and of printing
     prospectuses), word processing, duplicating, messenger, telephone and
     delivery expenses;

               (iv) fees and disbursements of counsel for the Company and,
     subject to Section 3(b), counsel for the selling Holders of the Registrable
     Securities;

               (v) fees and disbursements of all independent certified public
     accountants of the Company or any other Persons for which financial
     statements are required or otherwise included in such Registration
     Statement (including, without limitation, the expenses of any special audit
     and, in connection with any underwritten offering, "cold comfort" letters
     required by or incident to such performance);

               (vi) fees and expenses of other Persons (including special
     experts) retained by the Company; and

               (vii) fees and expenses associated with any NASD filing required
     to be made in connection with any Registration Statement.

     The Company will, in any event, pay its internal expenses (including,
without limitation, all salaries and expenses of its officers and employees
performing legal or accounting duties), the expense of any annual audit, the
fees and expenses incurred in connection with the listing of the securities to
be registered on each securities exchange on which securities of the same class
are then listed or the admission for trading of the securities to be registered
in each inter-dealer quotation system on which securities of the same class are
then traded, and rating agency fees.

          (b) In connection with each Registration Statement required hereunder,
the Company will reimburse the Holders of Registrable Securities being
registered pursuant to such Registration Statement for the reasonable fees and
disbursements of not more than one counsel

                                       11
<PAGE>
chosen by the Required Holders of the Registrable Securities being sold; the
expense of any additional counsel for the Holders shall be paid by the Holders.

          (c) The term "Registration Expenses" shall mean the expenses payable
by the Company pursuant to the provisions of this Section 3.

                     SECTION 4. Conditions to Registration.

     Each Holder's right to have Registrable Securities included in any
Registration Statement filed by the Company in accordance with the provisions of
Section 2 shall be subject to the following conditions:

          (a) The Holders on whose behalf such Registrable Securities are to be
included shall be required to furnish the Company in a timely manner with all
information required by the applicable rules and regulations of the SEC
concerning the proposed method or methods of disposition of such securities, the
identity of and compensation to be paid to any proposed underwriters to be
employed in connection therewith, and such other information as may be
reasonably required by the Company properly to prepare and file such
Registration Statement in accordance with applicable provisions of the
Securities Act;

          (b) If any such Holder desires to sell and distribute Registrable
Securities over a period of time, or from time to time, at then prevailing
market prices, then any such Holder shall execute and deliver to the Company
such written undertakings as the Company and its counsel may reasonably require
in order to assure full compliance with relevant provisions of the Securities
Act and the Exchange Act;

          (c) In the case of any registration requested pursuant to the
provisions of Section 2, the offering price for any Registrable Securities to be
so registered shall be no less than for any securities of the same class then to
be registered for sale for the account of the Company or other security holders,
unless such Registrable Securities are to be offered from time to time based on
the prevailing market price; and

          (d) In the case of any underwritten offering on behalf of the Holders
of Registrable Securities, such Holders will enter into such agreements
(including underwriting agreements and lock-up agreements) as the managing
underwriters shall reasonably request and as are customary in similar
circumstances, provided that no such agreements shall require any Holder to make
any representations or warranties to, or agreements with, the Company or the
underwriters other than representations, warranties or agreements regarding such
Holder, the ownership of such Holder's Registrable Securities and such Holder's
intended method of distribution.

                          SECTION 5. Indemnification.

          (a) Indemnification by the Company. In the event of the registration
of any Registrable Securities under the Securities Act pursuant to the
provisions hereof, the Company will indemnify and hold harmless each seller of
such Registrable Securities, its partners, directors, officers, employees and
agents, each underwriter, broker and dealer, if any, who participates in the
offering or sale of such securities, and each other Person, if any, who controls

                                       12
<PAGE>
such seller or any such underwriter, broker or dealer within the meaning of
either Section 15 of the Securities Act or Section 20 of the Exchange Act (each
such Person being hereinafter sometimes referred to as an "Indemnified Person,"
provided that for purposes of clauses (b), (c) and (d) of this Section 5,
"Indemnified Person" shall also include the Company, its partners, directors,
officers, employees and agents, and each other Person, if any, who controls the
Company within the meaning of either Section 15 of the Securities Act or Section
20 of the Exchange Act) from and against any losses, claims, damages,
liabilities or expenses, joint or several, to which such Indemnified Person may
become subject under the Securities Act, the Exchange Act or otherwise, insofar
as such losses, claims, damages, liabilities or expenses (or actions in respect
thereof) arise out of or are based upon any untrue statement or alleged untrue
statement of a material fact contained or incorporated by reference in any
Registration Statement or Prospectus or any amendment or supplement thereto or
any document incorporated by reference therein, or arise out of or are based
upon the omission or alleged omission to state therein a material fact required
to be stated therein or necessary to make the statements therein not misleading,
and will reimburse each such Indemnified Person for any legal or other expenses
reasonably incurred by such Indemnified Person in connection with investigating
or defending any such loss, claim, damage, liability, expense or action;
provided, however, that the Company will not be liable in any such case to the
extent that any such loss, claim, damage, liability, expense or action (i)
arises out of or is based upon an untrue statement or alleged untrue statement
or omission or alleged omission made or incorporated by reference in the
Registration Statement or Prospectus or any amendment or supplement thereto, in
reliance upon and in conformity with written information furnished to the
Company by such Indemnified Person specifically stating it is for use in
preparation thereof or (ii) arises out of the use of any Prospectus by an
Indemnified Party after the Company has provided such Indemnified Party with the
notice and supplement referred to in Section 2(c)(xi) if such Prospectus is the
subject of such notice. Such indemnity shall remain in full force and effect
regardless of any investigation made by or on behalf of such Indemnified Person
and shall survive the transfer of such Registrable Securities by such seller.

          (b) Indemnification by Holders of Registrable Securities. In the event
of the registration of any Registrable Securities under the Securities Act
pursuant to the provisions hereof, each Holder on whose behalf such Registrable
Securities shall have been registered will indemnify and hold harmless each and
every Indemnified Person against any losses, claims, damages, liabilities or
expenses, joint or several, to which such Indemnified Person may become subject
under the Securities Act, the Exchange Act or otherwise, insofar as such losses,
claims, damages, liabilities or expenses (or actions in respect thereof) arise
out of or are based upon any untrue statement or alleged untrue statement of a
material fact contained or incorporated by reference in any Registration
Statement or Prospectus or any amendment or supplement thereto or any document
incorporated by reference therein, or arise out of or are based upon the
omission or alleged omission to state therein a material fact required to be
stated therein or necessary to make the statements therein not misleading, which
untrue statement or alleged untrue statement or omission or alleged omission has
been made or incorporated therein in reliance upon and in conformity with
written information furnished to the Company by such Holder specifically stating
that it is for use in preparation thereof, and will reimburse each such
Indemnified Person for any legal or other expenses reasonably incurred by such
Indemnified Person in connection with investigating or defending any such loss,
claim, damage, liability, expense or action; provided, however, that the
liability of each Holder hereunder shall be limited

                                       13
<PAGE>
to the proceeds received by such Holder from the sale of Registrable Securities
covered by such Registration Statement.

          (c) Procedure. Promptly after receipt by an Indemnified Person of
notice of the commencement of any action (including any governmental
investigation or inquiry), such Indemnified Person will, if such Indemnified
Person intends to make a claim in respect thereof against the party agreeing to
indemnify such Indemnified Person pursuant to paragraph (a) or (b) hereof (each
such Person being hereinafter referred to as an "Indemnifying Person"), give
written notice to such Indemnifying Person of the commencement thereof, but the
omission so to notify the Indemnifying Person shall not relieve the Indemnifying
Person from any of its obligations pursuant to the provisions of this Section 5
except to the extent that the Indemnifying Person is actually prejudiced by such
failure to give notice. In case any such action is brought against any
Indemnified Person and it notifies an Indemnifying Person of the commencement
thereof, the Indemnifying Person shall be entitled to participate in, and to the
extent that it may wish, jointly with any other Indemnifying Person similarly
notified, to assume the defense thereof, with counsel reasonably satisfactory to
such Indemnified Person, and after notice from the Indemnifying Person to such
Indemnified Person, the Indemnifying Person shall not, except as hereinafter
provided, be responsible for any legal or other expenses subsequently incurred
by such Indemnified Person in connection with the defense thereof. No
Indemnifying Person will consent to entry of any judgment or enter into any
settlement which does not include as an unconditional term thereof the giving by
the claimant or plaintiff to such Indemnified Person of a release from all
liability in respect of such claim or litigation.

     Such Indemnified Person shall have the right to employ separate counsel in
any such action and to participate in the defense thereof, but the fees and
expenses of such counsel shall be the expense of such Indemnified Person unless
(a) the Indemnifying Person has agreed to pay such fees and expenses or (b) the
Indemnifying Person shall have failed to assume the defense of such action or
proceeding or has failed to employ counsel reasonably satisfactory to such
Indemnified Person in any such action or proceeding or (c) the named parties to
any such action or proceeding (including any impleaded parties) include both
such Indemnified Person and the Indemnifying Person and such Indemnified Person
shall have been advised by counsel that representation of both parties by the
same counsel would be inappropriate due to actual or potential material
differing interests between them (in which case, if such Indemnified Person
notifies the Indemnifying Person in writing that it elects to employ separate
counsel at the expense of the Indemnifying Person, the Indemnifying Person shall
not have the right to assume the defense of such action or proceeding on behalf
of such Indemnified Person). The Indemnifying Person shall not be liable for any
settlement of any such action or proceeding effected without its written
consent, which consent shall not unreasonably be withheld, delayed or
conditioned, but if settled with its written consent, or if there is a final
judgment for the plaintiff in any such action or proceeding, the Indemnifying
Person agrees to indemnify and hold harmless such Indemnified Persons from and
against any loss or liability by reason of such settlement or judgment.

          (d) Contribution. To the extent that the indemnification provided for
in this Section 5 is unavailable to a party that would have been an Indemnified
Person under this Section 5 in respect of any losses, claims, damages,
liabilities or expenses (or actions in respect thereof) referred to herein, then
each party that would have been an Indemnifying Person

                                       14
<PAGE>
thereunder shall, in lieu of indemnifying such Indemnified Person, contribute to
the amount paid or payable by such Indemnified Person as a result of such
losses, claims, damages, liabilities or expenses (or actions in respect thereof)
in such proportion as is appropriate to reflect the relative fault of the
Indemnifying Person on the one hand and the Indemnified Person on the other in
connection with the statement or omission which resulted in such losses, claims,
damages, liabilities or expenses (or actions in respect thereof), as well as any
other relevant equitable considerations. The relative fault shall be determined
by reference to, among other things, whether the untrue or alleged untrue
statement of a material fact or the omission or alleged omission of a material
fact relates to information supplied by the Indemnifying Person or the
Indemnified Person and the parties' relative intent, knowledge, access to
information and opportunity to correct or prevent such statement or omission.
The amount paid or payable by a party as a result of the losses, claims,
damages, liabilities and expenses referred to above shall be deemed to include,
subject to the limitations set forth in Section 5(c), any legal or other fees or
expenses reasonably incurred by such party in connection with the investigation
or defense of any action or claim. The Company and each Holder of Registrable
Securities agrees that it would not be just and equitable if contribution
pursuant to this Section 5 were determined by pro rata allocation or by any
other method of allocation which does not take account of the equitable
considerations referred to in this Section 5. Notwithstanding the provisions of
this Section 5(d), no Holder of Registrable Securities shall be required to
contribute any amount in excess of the amount by which the total price at which
the Registrable Securities sold by it exceeds the amount of any damages which
such Holder has otherwise been required to pay by reason of such untrue or
alleged untrue statement or omission or alleged omission.

     No Person guilty of fraudulent misrepresentation (within the meaning of
Section 11(f) of the Securities Act) shall be entitled to contribution from any
Person who was not guilty of such fraudulent misrepresentation.

     Indemnification or, if appropriate, contribution, similar to that specified
in the preceding provisions of this Section 5 (with appropriate modifications)
shall be given by the Company and each seller of Registrable Securities with
respect to any required registration or other qualification of such securities
under any federal or state law or regulation or governmental authority other
than the Securities Act.

     In the event of any underwritten offering of Registrable Securities under
the Securities Act pursuant to the provisions of Section 2, the Company and each
Holder on whose behalf such Registrable Securities shall have been registered
agree to enter into an underwriting agreement, in customary form, with the
underwriters, which underwriting agreement may contain additional provisions
with respect to indemnification and contribution in lieu thereof.

           SECTION 6. Exchange Act Registration; Rule 144 Reporting.

     The Company covenants and agrees that until such time as the Holders no
longer hold any Registrable Securities it will:

          (a) if required by law, maintain an effective registration statement
(containing such information and documents as the SEC shall specify) with
respect to the Common Stock of the Company under Section 12(g) of the Exchange
Act;

                                       15
<PAGE>
          (b) make and keep public information available, as those terms are
understood and defined in Rule 144 under the Securities Act, even if the Company
subsequently ceases to be subject to the reporting requirements of the Exchange
Act;

          (c) file with the SEC in a timely manner all reports and documents
required of the Company under the Securities Act and the Exchange Act;

          (d) furnish to any Holder promptly upon request (i) a written
statement by the Company as to its compliance with the reporting requirements of
Rule 144 (and any similar or successor rules) and of the Securities Act and the
Exchange Act, (ii) a copy of the most recent annual or quarterly report of the
Company and (iii) such other reports and documents of the Company and other
information in the possession of or reasonably obtainable by the Company as such
Holder may reasonably request in availing itself of any rule or regulation of
the SEC allowing such Holder to sell any such securities without registration;
and

          (e) take such further action as any Holder of Registrable Securities
may from time to time reasonably request to enable such Holder to sell
Registrable Securities without registration under the Securities Act within the
limitation of the exemptions provided by (i) Rule 144 under the Securities Act,
as such rule may be amended from time to time, or (ii) any similar rule or
regulation hereafter adopted by the SEC.

     The Company represents and warrants that such registration statement or any
information, document or report filed with the SEC in connection therewith or
any information so made public shall not contain any untrue statement of a
material fact or omit to state a material fact required to be stated therein or
necessary in order to make the statements contained therein not misleading. The
Company agrees to indemnify and hold harmless (or to the extent the same is not
enforceable, make contribution to) the Holders, their partners, officers,
directors, employees and agents, each broker, dealer or underwriter (within the
meaning of the Securities Act) acting for any Holder in connection with any
offering or sale by such Holder of Registrable Securities or any Person
controlling (within the meaning of either Section 15 of the Securities Act or
Section 20 of the Exchange Act) such Holder and any such broker, dealer or
underwriter from and against any and all losses, claims, damages, liabilities or
expenses (or actions in respect thereof) arising out of or resulting from any
breach of the foregoing representation or warranty, all on terms and conditions
comparable to those set forth in Section 5.

            SECTION 7. Limitation on Registration Rights of Others.

     The Company represents and warrants that, except as provided in the 1997
Registration Rights Agreement, it has not granted to any Person the right to
request or require the Company to register any securities issued by the Company.
The Company covenants and agrees that after the date hereof, so long as any
Holder holds any Warrant Securities, the Company will not, directly or
indirectly, grant to any Person or agree to or otherwise become obligated in
respect of (a) any registration rights of securities of the Company upon the
demand of any Person (including any shelf registration) without the prior
written consent of the Required Holders; or (b) rights of registration in the
nature or substantially in the nature of those set forth in Section 2(a) unless
such rights are expressly subject and subordinated to the rights of registration
of the Holders pursuant to Section 2(a) hereof on terms reasonably satisfactory
to the Required Holders.

                                       16
<PAGE>
                            SECTION 8. Mergers, etc.

     In addition to any other restrictions on mergers, consolidations and
reorganizations contained in the Purchase Agreement or in the certificate of
incorporation, bylaws or agreements of the Company, the Company covenants and
agrees that it shall not, directly or indirectly, enter into any merger,
consolidation or reorganization in which the Company shall not be the surviving
corporation and in which the Holders shall not have had the right to receive
cash for all their Registrable Securities, unless the surviving corporation
shall, prior to such merger, consolidation or reorganization, agree in a writing
satisfactory in form, scope and substance to the Required Holders to assume the
obligations of the Company under this Agreement, and for such purpose references
hereunder to "Registrable Securities" shall be deemed to include the securities
which such Holders would be entitled to receive in exchange for Registrable
Securities pursuant to any such merger, consolidation or reorganization.

     If, and as often as, there are any changes in the Registrable Securities by
way of stock split, stock dividend, combination or classification, or through
merger, consolidation, reorganization or recapitalization, or by any other
means, appropriate adjustments shall be made in the provisions hereof as may be
required, so that the rights and privileges granted hereby shall continue with
respect to the Registrable Securities as so changed.

                            SECTION 9. Notices, etc.

     All notices, consents, approvals, agreements and other communications
provided hereunder shall be in writing or by telex or telecopy and shall be
sufficiently given to the Purchasers, the Holders or the Company if addressed or
delivered to them: (i) if to the Company or any Purchaser, as set forth in the
Purchase Agreement, (ii) if to any other Holder, at its last known address
appearing on the books of the Company maintained for such purpose, or in any
such case, at such other address as any party may designate to any other party
by written notice. All such notices and communications shall be deemed to have
been duly given: (i) at the time delivered by hand, if personally delivered,
(ii) when received, if deposited in the mail, postage prepaid, (iii) when
transmission is verified, if telecopied, and (iv) on the next Business Day, if
timely delivered to an air courier guaranteeing overnight delivery.

                          SECTION 10. Entire Agreement.

     The parties hereto agree that this Agreement constitutes the entire
agreement among the parties with respect to the subject matter hereof and
supersedes all prior agreements and understandings between them as to such
subject matter; and there are no restrictions, agreements, arrangements, oral or
written, between any or all of the parties relating to the subject matter hereof
which are not fully expressed or referred to herein or therein.

             SECTION 11. Amendments; Waivers and Further Agreements.

     This Agreement may not be amended nor shall any waiver, change,
modification, consent or discharge be effected except by an instrument in
writing executed by or on behalf of the party or parties against whom
enforcement of any amendment, waiver, change, modification, consent or discharge
is sought; provided, however, that any waiver sought from the Holders of any
provision of this Agreement which affects the Holders generally, and any action
required to be

                                       17
<PAGE>
taken by the Holders as a group pursuant to this Agreement, shall be given or
taken by the Required Holders, and any such waiver or action so given or taken
shall be binding on all Holders. No failure or delay by any party in exercising
any right or remedy hereunder shall operate as a waiver thereof, and a waiver of
a particular right or remedy on one occasion shall not be deemed a waiver of any
other right or remedy or a waiver of the same right or remedy on any subsequent
occasion.

     Any waiver of any terms or conditions of this Agreement shall not operate
as a waiver of any other breach of such terms or conditions or any other term or
condition, nor shall any failure to enforce any provision hereof operate as a
waiver of such provision or of any other provision hereof; provided, however,
that no such written waiver, unless it by its own terms explicitly provides to
the contrary, shall be construed to effect a continuing waiver of the provision
being waived and no such waiver in any instance shall constitute a waiver in any
other instance or for any other purpose or impair the right of the party against
whom such waiver is claimed in all other instances or for all other purposes to
require full compliance with such provision. Each of the parties hereto agrees
to execute all such further instruments and documents and to take all such
further action as the other parties may reasonably require in order to
effectuate the terms and purposes of this Agreement.

                 SECTION 12. Assignment; Successors and Assigns.

     This Agreement shall be binding upon and shall inure to the benefit of the
parties hereto and their respective heirs, executors, legal representatives,
successors and permitted assigns, including, without limitation, any Holders
from time to time of the Registrable Securities. Anything in this Agreement to
the contrary notwithstanding, the term "Holders" as used in this Agreement shall
be deemed to include the registered Holders from time to time of the Warrant
Securities. Nothing herein shall be construed as requiring the Holders of
Warrants to exercise their warrants for, or convert their Warrants into, shares
of Common Stock prior to exercising the rights conferred upon such Holders under
this Agreement.

                            SECTION 13. Severability.

     If any provision of this Agreement shall be held or deemed to be, or shall
in fact be, invalid, inoperative or unenforceable as applied to any particular
case in any jurisdiction or jurisdictions, or in all jurisdictions or in all
cases, because any provision conflicts with any constitution, statute, rule or
public policy, or for any other reason, such circumstance shall not have the
effect of rendering the provision or provisions in question invalid, inoperative
or unenforceable in any other jurisdiction or in any other case or circumstance
or of rendering any other provision or provisions herein contained invalid,
inoperative or unenforceable to the extent that such other provisions are not
themselves actually in conflict with such constitution, statute, rule or public
policy, but this Agreement shall be reformed and construed in any such
jurisdiction or case as if such invalid, inoperative or unenforceable provision
had never been contained herein and such provision reformed so that it would be
valid, operative and enforceable to the maximum extent permitted in such
jurisdiction or in such case.

                                       18
<PAGE>
                            SECTION 14. Counterparts.

     This Agreement may be executed in two or more counterparts (each of which
need not be executed by each of the parties), each of which shall be deemed an
original, but all of which together shall constitute one and the same
instrument, and in pleading or proving any provision of this Agreement, it shall
not be necessary to produce more than one such counterpart.

                           SECTION 15. Gender; Usage.

     Whenever used herein the singular number shall include the plural, the
plural shall include the singular, and the use of any gender shall include all
genders. The words "hereof," "herein" and "hereunder," and words of similar
import, when used in this Agreement shall refer to this Agreement as a whole and
not to any particular provision of this Agreement.

                           SECTION 16. Governing Law.

     THIS AGREEMENT SHALL BE GOVERNED BY AND CONSTRUED AND ENFORCED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK OTHER THAN THE CONFLICTS OF
LAWS PRINCIPLES THEREOF.

                              SECTION 17. Survival.

     The indemnification and contribution provisions of Section 5 shall survive,
notwithstanding the fact that any Warrant Shares shall cease to be Registrable
Securities.

                              SECTION 18. Expenses.

     Supplementing the provisions of Section 5, the Company shall be obligated
to pay to the Holders, on demand, all costs and expenses (including, without
limitation, court costs and attorneys' fees and expenses and interest to the
extent permitted by applicable law on overdue amounts) paid or incurred in
collecting any sums due from, or enforcing any other obligations of, the
Company.

                        SECTION 19. Specific Performance.

     The Company recognizes that the rights of the Holders under this Agreement
are unique and, accordingly, the Holders shall, in addition to such other
remedies as may be available to any of them at law or in equity, have the right
to enforce their rights hereunder by actions for injunctive relief and specific
performance to the extent permitted by law. The Company agrees that monetary
damages would not be adequate compensation for any loss incurred by reason of a
breach by it of the provisions of this Agreement and hereby agrees to waive the
defense in any action for specific performance that a remedy at law would be
adequate. This Agreement is not intended to limit or abridge any rights of the
Holders which may exist apart from this Agreement.

                                       19
<PAGE>
     IN WITNESS WHEREOF, the parties hereto have caused this Agreement to be
executed by their respective officers thereunto duly authorized as of the day
and year first above written.

                                        HORIZON OFFSHORE, INC.

                                        By:
                                            ------------------------------------
                                               Name:
                                               Title:

                                        GUARANTORS:

                                        HORIZON VESSELS, INC.

                                        By:
                                            ------------------------------------
                                               Name:
                                               Title:

                                        HORIZON OFFSHORE CONTRACTORS, INC.

                                        By:
                                            ------------------------------------
                                               Name:
                                               Title:

                                        HORIZON SUBSEA SERVICES, INC.

                                        By:
                                            ------------------------------------
                                               Name:
                                               Title:

                                       20
<PAGE>
                                        HORIZON VESSELS INTERNATIONAL, LTD.

                                        By:
                                            ------------------------------------
                                               Name:
                                               Title:

                                        HORIZEN, LLC

                                        By:
                                            ------------------------------------
                                               Name:
                                               Title:

                                        ECH OFFSHORE, S. DE R.L. DE C.V.

                                        By:
                                            ------------------------------------
                                               Name:
                                               Title:

                                        HOC OFFSHORE, S. DE R.L. DE C.V.

                                        By:
                                            ------------------------------------
                                               Name:
                                               Title:

                                       21
<PAGE>
                                        INITIAL PURCHASERS:

                                        ELLIOTT ASSOCIATES, L.P.

                                        By: Elliott Capital Advisors, L.P.,
                                            as General Partner

                                        By: Braxton Associates, Inc.,
                                            as General Partner

                                        By:
                                            ------------------------------------
                                               Name:
                                               Title:

                                        Address: 712 Fifth Avenue
                                                 36th Floor
                                                 New York, New York 10019

                                        ELLIOTT INTERNATIONAL, L.P.

                                        By: Elliott International Capital
                                            Advisors Inc., as
                                            Attorney-in-Fact

                                        By:
                                            ------------------------------------
                                               Name:
                                               Title:

                                        Address: 712 Fifth Avenue
                                                 36th Floor
                                                 New York, New York 10019

                                       22
<PAGE>
                                        FALCON MEZZANINE PARTNERS, LP

                                        By: Falcon Mezzanine Investments, LLC,
                                            its General Partner

                                        By:
                                            ------------------------------------
                                               Name:
                                               Title:

                                        Address: 60 Kendrick Street
                                                 Needham, Massachusetts 02494
                                        Telecopier No.: (781) 247-7299

                                       23
<PAGE>
                                        D. E. SHAW LAMINAR PORTFOLIOS, L.L.C.

                                        By:
                                            ------------------------------------
                                               Name:
                                               Title:

                                        Address: 120 West 45th St.
                                                 New York, New York 10036

                                       24
<PAGE>
                                        ----------------------------------------
                                        Name: Kevin G. Douglas,
                                                 in his individual capacity

                                        Address: 1101 5th Ave., Suite 360
                                                 San Rafael, CA 94901

                                       25
<PAGE>
                                        ----------------------------------------
                                        Name: Michelle M. Douglas,
                                                 in her individual capacity

                                        Address: 1101 5th Ave., Suite 360
                                                 San Rafael, CA 94901

                                       26
<PAGE>
                                        ----------------------------------------
                                        Name: Lloyd I. Miller,
                                                 in his individual capacity

                                        Address: 4550 Gordon Drive
                                                 Naples, FL 34102

                                       27
<PAGE>
                                        JMB CAPITAL PARTNERS, LP

                                        By:
                                            ------------------------------------
                                               Name: Ron D. Silverton
                                               Title: General Partner

                                        Address: 1999 Avenue of the Stars, Suite
                                                 2040 Los Angeles,
                                                 CA 90067

                                       28
<PAGE>
                                        SACC PARTNERS, LP

                                        By:
                                            ------------------------------------
                                               Name: Tom Kelleher
                                               Title:  General Partner

                                        Address: 11150 Santa Monica Blvd., Suite
                                                 750 Los Angeles, CA 90025

                                       29
<PAGE>
                                        KEVIN G. DOUGLAS AND MICHELLE M.
                                        DOUGLAS, JTWROS

                                        By:
                                            ------------------------------------
                                               Name: Kevin Douglas
                                               in his capacity as joint tenant
                                               with right of survivorship

                                        By:
                                            ------------------------------------
                                               Name: Michelle Douglas
                                               in her capacity as joint tenant
                                               with right of survivorship

                                        Address: 1101 5th Ave., Suite 360
                                                 San Rafael, CA 94901

                                       30
<PAGE>
                                        DOUGLAS FAMILY TRUST

                                        By:
                                            ------------------------------------
                                               Name: James E. Douglas Jr.
                                               Title: Trustee

                                        By:
                                            ------------------------------------
                                               Name: Jean A. Douglas
                                               Title: Trustee

                                        Address: 1101 5th Ave., Suite 360
                                                 San Rafael, CA 94901

                                       31
<PAGE>
                                        JAMES DOUGLAS AND JEAN DOUGLAS
                                        IRREVOCABLE DESCENDANT'S TRUST

                                        By:
                                            ------------------------------------
                                               Name: Kevin Douglas
                                               Title: Trustee

                                        By:
                                            ------------------------------------
                                               Name: Michelle Douglas
                                               Title: Trustee

                                        Address: 1101 5th Ave., Suite 360
                                                 San Rafael, CA 94901

                                       32
<PAGE>
                                        B. RILEY & CO. PROFIT SHARING, INC.

                                        By:
                                            ------------------------------------
                                               Name: Bryant Riley
                                               Title: Trustee

                                        Address: 11150 Santa Monica Blvd., Suite
                                                 750 Los Angeles, CA 90025

                                       33
<PAGE>
                                        B. RILEY & CO., INC.

                                        By:
                                            ------------------------------------
                                               Name: Bryant Riley
                                               Title: Chairman

                                        Address: 11150 Santa Monica Blvd., Suite
                                                 750 Los Angeles, CA 90025

                                       34
<PAGE>
                                        L. MILLER III GST DTD 12/31/91

                                        By:
                                            ------------------------------------
                                               Name: Lloyd I. Miller
                                               Title: Trustee

                                        Address: 4550 Gordon Drive
                                                 Naples, FL 34102

                                       35
<PAGE>
                                        MILFAM, LLC

                                        By:
                                            ------------------------------------
                                               Name: Lloyd I. Miller
                                               Title: General Partner

                                        Address: 4550 Gordon Drive
                                                 Naples, FL 34102

                                       36
<PAGE>
                                        CATHERINE C. MILLER IRREV TR DTD
                                        3/26/91

                                        By:
                                            ------------------------------------
                                               Name: Lloyd I. Miller
                                               Title: Trustee

                                        Address: 4550 Gordon Drive
                                                 Naples, FL 34102

                                       37
<PAGE>
                                        ALEXANDRA B. MILLER

                                        By:
                                            ------------------------------------
                                               Name: Lloyd I. Miller
                                               Title: Custodian FL/UTMA

                                        Address: 4550 Gordon Drive
                                                 Naples, FL 34102

                                       38
<PAGE>
                                        LLOYD I. MILLER

                                        By:
                                            ------------------------------------
                                               Name: Lloyd I. Miller
                                               in his individual capacity

                                        Address: 4550 Gordon Drive
                                                 Naples, FL 34102

                                       39
<PAGE>
                                        LLOYD I. MILLER TRUST A-4

                                        BY: PNC BANK

                                        By:
                                            ------------------------------------
                                               Name: Alan Goldman
                                               Title: Trustee

                                        Address: 4550 Gordon Drive
                                                 Naples, FL 34102

                                       40
<PAGE>
                                        MILFAM I, L.P.

                                        By:
                                            ------------------------------------
                                               Name: Lloyd I. Miller
                                               Title: Limited Partner

                                        Address: 4550 Gordon Drive
                                                 Naples, FL 34102

                                       41
<PAGE>
                                        MILFAM II, L.P.

                                        By:
                                            ------------------------------------
                                               Name: Lloyd I. Miller
                                               Title: Limited Partner

                                        Address: 4550 Gordon Drive
                                                 Naples, FL 34102

                                       42
<PAGE>
                                        MILGRAT II PREMIUM

                                        By:
                                            ------------------------------------
                                               Name: Lloyd I. Miller
                                               Title: Trustee

                                        Address: 4550 Gordon Drive
                                                 Naples, FL 34102

                                       43
<PAGE>
                                        HIGHLAND CRUSADER OFFSHORE
                                        PARTNERS

                                        By:
                                            ------------------------------------
                                               Name: Kurt Plummer
                                               Title: General Partner

                                        Address: 13455 Noel Road, Suite 1300
                                                 Dallas, TX 75240

                                       44<PAGE>
                                                                  EXHIBIT 10.43

                        SIXTH AMENDMENT TO LOAN AGREEMENT

         THIS SIXTH AMENDMENT TO LOAN AGREEMENT (this "Amendment"), dated as of
January 30, 2004, is between HORIZON OFFSHORE CONTRACTORS, INC., a Delaware
corporation ("Contractors"), HORIZON SUBSEA SERVICES, INC., a Delaware
corporation ("Subsea"), and HORIZON VESSELS, INC., a Delaware corporation
("Vessels", and together with Contractors and Subsea the "Borrowers"), jointly
and severally, each of the financial institutions which is or may from time to
time become a party to such Loan Agreement, as amended (collectively, "Lenders",
and each a "Lender"), and SOUTHWEST BANK OF TEXAS, N.A., a national banking
association, as agent (the "Agent").

                                    RECITALS:

A. Borrowers, Lenders and Agent entered into that certain Loan Agreement dated
as of March 26, 2001, as amended by First Amendment to Loan Agreement dated as
of April 17, 2002, Second Amendment to Loan Agreement dated as of May 30, 2002,
Third Amendment to Loan Agreement dated as of August 28, 2002, Fourth Amendment
to Loan Agreement dated as of September 30, 2002 and Fifth Amendment to Loan
Agreement dated as of March 6, 2003 (the "Agreement").

         A. Pursuant to the Agreement, Horizon Offshore, Inc., a Delaware
corporation ("Guarantor"), executed a Guaranty dated as of March 26, 2001 (the
"Guaranty") pursuant to which Guarantor guaranteed to Agent the payment and
performance of the Obligations (as defined in the Agreement).

         B. Pursuant to the Agreement all the other subsidiaries of Guarantor
executed guaranty agreements pursuant to which such Subsidiaries guaranteed the
obligations of Borrowers under the Loan Agreement.

         C. Borrowers, Lenders and Agent now desire to amend the Agreement as
herein set forth.

         NOW, THEREFORE, in consideration of the premises herein contained and
other good and valuable consideration, the receipt and sufficiency of which are
hereby acknowledged, the parties hereto agree as follows:

                                   1. ARTICLE

                                   Definitions

1.1. Section Definitions. Capitalized terms used in this Amendment, to the
extent not otherwise defined herein, shall have the meanings given to such terms
in the Agreement, as amended hereby.

<PAGE>

                                   2. ARTICLE

                                   Amendments

2.1. Section Amendment to Certain Definitions. The definition of each of the
following terms contained in Section 1.1 of the Agreement is amended to read in
its respective entirety as follows:

         "Foreign Loan Agreement" means that certain EXIM Guaranteed Loan
         Agreement among Borrowers, LLC, the Foreign Agent and the lenders
         referred to therein, as amended by First Amendment to EXIM Guaranteed
         Loan Agreement dated April 17, 2002, Second Amendment to EXIM
         Guaranteed Loan Agreement dated August 28, 2002, Third Amendment to
         EXIM Guaranteed Loan Agreement dated September 30, 2002, Fourth
         Amendment to EXIM Guaranteed Loan Agreement dated March 6, 2003 and
         Fifth Amendment to EXIM Guaranteed Loan Agreement dated January 30,
         2004, and as the same may be further amended, supplemented or modified
         from time to time, and any loan agreement or credit agreement executed
         in restatement and replacement therefor.

2.2. Section Amendment to Section 7.1. (a) Clauses (e), (f) and (h) contained in
Section 7.1 of the Agreement are amended to read in their entirety as follows:

         (e) Borrowing Base Certificate. As soon as available, and in any event
         within fifteen (15) days after the end of each month of each fiscal
         year of Borrowers, a Borrowing Base Certificate as of the last day of
         such month certified by an officer of each Borrower acceptable to
         Agent.

         (f) Weekly Accounts Receivable Reports. Beginning not later than 5:00
         p.m. on February 9, 2004, and continuing not later than 5:00 p.m. on
         each Monday thereafter, aged accounts receivable reports for each
         Borrower as of the previous Friday at 5:00 p.m., certified by an
         officer of each Borrower acceptable to Agent.

         (h) Projections. Not later than February 2, 2004, a projected balance
         sheet, income statement and statement of cash flows for Guarantor and
         its Subsidiaries for the fiscal year ending December 31, 2004 on a Base
         Case basis and a Best Case basis each, certified by an officer of
         Guarantor acceptable to Agent and reviewed by FTI Consulting, Inc.

         (b) Clauses (o), (p), (q) and (r) shall be added to Section 7.1 of the
Agreement and shall read in their entirety as follows:

         (o) Weekly Accounts Payable Reports. Beginning not later than 5:00 p.m.
         on February 9, 2004, and continuing not later than 5:00 p.m. on each
         Monday thereafter, aged accounts payable reports for each Borrower, as
         of the previous Friday at 5:00 p.m. certified by an officer of each
         Borrower acceptable to Agent.

                                      -2-

<PAGE>

         (p) Weekly Cash Flow. Beginning not later than 5:00 p.m. on February 9,
         2004, and continuing not later than 5:00 p.m. on each Monday
         thereafter, cash flow reports for each Borrower, on a rolling thirteen
         (13) week basis for the thirteen (13) consecutive weeks ended as of the
         previous Friday at 5:00 p.m. certified by an officer of each Borrower
         acceptable to Agent.

         (q) Elliott Term Sheet. Not later than February 2, 2004, a Confidential
         Information Memorandum prepared by Raymond James, containing, among
         other things, terms related to the issuance of subordinated bonds in an
         amount not less than $50,000,000.00 to be purchased by Elliott
         Associates, L.P and/or other investors.

         (r) Availability Certificate. Not later than 15 days after February 16,
         2004 and March 15, 2004, a certificate of Borrower (certified by an
         officer of each Borrower acceptable to Agent), containing a calculation
         of availability under the Borrowing Base ("Availability") as of such
         February 16 and March 15 (as if such date were a date on which the
         Borrowing Base was otherwise required to be determined pursuant to this
         Agreement), and, if Availability is determined to be zero or a negative
         amount, a statement regarding the actions to be taken by Borrowers and
         the events which are expected to take place such that by the end of
         such month, Availability will be a positive number.

                                   3. ARTICLE

                              Conditions Precedent

3.1. Section Conditions. The effectiveness of this Amendment is subject to the
receipt by Agent of the following, each in form and substance satisfactory to
Agent and Lenders:

         (a) Certificate-Each Borrower. A certificate of the Secretary or
         another officer of each Borrower acceptable to Agent certifying (i)
         resolutions of the board of directors of each Borrower which authorize
         the execution, delivery and performance by such Borrower of this
         Amendment and the other Loan Documents to which such Borrower is or is
         to be a party, and (ii) the names of the officers of each Borrower
         authorized to sign this Amendment and each of the other Loan Documents
         to which such Borrower is or is to be a party together with specimen
         signatures of such officers.

         (b) Fees. An amendment fee payable to Agent for the Pro-Rata benefit of
         Lenders in the amount of $75,000.00, and an amendment fee payable to
         the Agent in the amount of $5,000.00.

         (c) Additional Information. Such additional documents, instruments and
         information as Lenders or Agent may request.

                                      -3-

<PAGE>

                                   4. ARTICLE

                 Ratifications, Representations, and Warranties

4.1. Section Ratifications. The terms and provisions set forth in this Amendment
shall modify and supersede all inconsistent terms and provisions set forth in
the Agreement and except as expressly modified and superseded by this Amendment,
the terms and provisions of the Agreement are ratified and confirmed and shall
continue in full force and effect. Borrowers and Lenders agree that the
Agreement as amended hereby shall continue to be the legal, valid and binding
obligation of such Persons enforceable against such Persons in accordance with
its terms.

         (a) Section Representations, Warranties and Agreements. Each Borrower
         hereby represents and warrants to Lenders that the execution, delivery,
         and performance of this Amendment and any and all other Loan Documents
         executed or delivered in connection herewith have been authorized by
         all requisite action on the part of such Borrower and will not violate
         the Organizational Documents of such Borrower, the representations and
         warranties contained in the Agreement as amended hereby, and all other
         Loan Documents are true and correct on and as of the date hereof as
         though made on and as of the date hereof, no Event of Default or
         Unmatured Event of Default has occurred and is continuing, Borrowers
         are in full compliance with all covenants and agreements contained in
         the Agreement as amended hereby, Borrowers are indebted to Lenders
         pursuant to the terms of the Notes, as the same may have been renewed,
         modified, extended and rearranged, the liens, security interests,
         encumbrances and assignments created and evidenced by the Loan
         Documents are, respectively, valid and subsisting liens, security
         interests, encumbrances and assignments and secure the Notes as the
         same may have been renewed, modified or rearranged, and no Borrower has
         any claims, credits, offsets, defenses or counterclaims arising from
         the Loan Documents or any Lender's performance under the Loan
         Documents.

                                   5. ARTICLE

                                  Miscellaneous

5.1. Section Survival of Representations and Warranties. All representations and
warranties made in this Amendment or any other Loan Documents including any Loan
Document furnished in connection with this Amendment shall fully survive the
execution and delivery of this Amendment and the other Loan Documents, and no
investigation by any Lender or any closing shall affect the representations and
warranties or the right of any Lender to rely on them.

5.2. Section Reference to Agreement. Each of the Loan Documents, including the
Agreement and any and all other agreements, documents, or instruments now or
hereafter executed and delivered pursuant to the terms hereof or pursuant to the
terms

                                      -4-

<PAGE>

of the Agreement, as amended hereby, are hereby amended so that any reference in
such Loan Documents to the Agreement shall mean a reference to the Agreement, as
amended hereby.

5.3. Section Expenses. As provided in the Agreement, Borrowers agree to pay on
demand all costs and expenses incurred by Agent in connection with the
preparation, negotiation and execution of this Amendment and the other documents
and instruments executed pursuant hereto and any and all amendments,
modifications and supplements thereto, including, without limitation, the costs
and fees of Agent's legal counsel, and all costs and expenses incurred by Agent
in connection with the enforcement or preservation of any rights under the
Agreement, as amended hereby, or any other Loan Document, including, without
limitation, the costs and fees of Agent's legal counsel.

5.4. Section Severability. Any provision of this Amendment held by a court of
competent jurisdiction to be invalid or unenforceable shall not impair or
invalidate the remainder of this Amendment and the effect thereof shall be
confined to the provision so held to be invalid or unenforceable.

5.5. SECTION APPLICABLE LAW. THIS AMENDMENT AND ALL OTHER LOAN DOCUMENTS
EXECUTED PURSUANT HERETO SHALL BE DEEMED TO HAVE BEEN MADE AND TO BE PERFORMABLE
IN HOUSTON, HARRIS COUNTY, TEXAS AND SHALL BE GOVERNED BY AND CONSTRUED IN
ACCORDANCE WITH THE LAWS OF THE STATE OF TEXAS.

5.6. Section Successors and Assigns. This Amendment is binding upon and shall
inure to the benefit of Agent, Issuing Bank, each Lender and each Borrower and
their respective successors and assigns, except that no Borrower may assign or
transfer any of its rights or obligations hereunder without the prior written
consent of Agent.

5.7. Section Counterparts. This Amendment may be executed in one or more
counterparts, each of which when so executed shall be deemed to be an original,
but all of which when taken together shall constitute one and the same
instrument.

5.8. Section Effect of Waiver. No consent or waiver, express or implied, by
Agent, Issuing Bank or any Lender to or for any breach of or deviation from any
covenant, condition or duty by any Borrower shall be deemed a consent or waiver
to or of any other breach of the same or any other covenant, condition or duty.

5.9. Section Headings. The headings, captions, and arrangements used in this
Amendment are for convenience only and shall not affect the interpretation of
this Amendment.

5.10. SECTION AMENDMENT TO LETTER AGREEMENTS. EFFECTIVE AS OF THE DATE OF THIS
AMENDMENT, (A) THE FIFTH PARAGRAPH CONTAINED IN THE LETTER AGREEMENT DATED
AUGUST 7, 2003 (THE "FIRST LETTER

                                      -5-

<PAGE>

AGREEMENT") AND (B) THE FIFTH PARAGRAPH CONTAINED IN THE LETTER AGREEMENT DATED
NOVEMBER 10, 2003 (THE "SECOND LETTER AGREEMENT") ARE NO LONGER IN EFFECT, AND
THE FIRST LETTER AGREEMENT AND THE SECOND LETTER AGREEMENT ARE AMENDED TO DELETE
THE FIFTH PARAGRAPHS IN THEIR ENTIRETY. ALL PARTIES HERETO AGREE TO SUCH
DELETION.

5.11. SECTION ENTIRE AGREEMENT. THIS AMENDMENT AND ALL OTHER INSTRUMENTS,
DOCUMENTS, AND AGREEMENTS EXECUTED AND DELIVERED IN CONNECTION WITH THIS
AMENDMENT EMBODY THE FINAL, ENTIRE AGREEMENT AMONG THE PARTIES HERETO WITH
RESPECT TO THE SUBJECT MATTER HEREOF AND THEREOF AND SUPERSEDE ANY AND ALL PRIOR
COMMITMENTS, AGREEMENTS, REPRESENTATIONS AND UNDERSTANDINGS, WHETHER WRITTEN OR
ORAL, RELATING TO THIS AMENDMENT AND THE OTHER INSTRUMENTS, DOCUMENTS AND
AGREEMENTS EXECUTED AND DELIVERED IN CONNECTION WITH THIS AMENDMENT, AND MAY NOT
BE CONTRADICTED OR VARIED BY EVIDENCE OF PRIOR, CONTEMPORANEOUS OR SUBSEQUENT
ORAL AGREEMENTS OR DISCUSSIONS OF THE PARTIES HERETO. THERE ARE NO ORAL
AGREEMENTS AMONG THE PARTIES HERETO.

         Executed as of the date first written above.

                                         BORROWERS:

                                         HORIZON OFFSHORE CONTRACTORS, INC.

                                         By:
                                             ----------------------------------
                                             David W. Sharp
                                             Executive Vice President

                                         HORIZON SUBSEA SERVICES, INC.

                                         By:
                                             ----------------------------------
                                             David W. Sharp
                                             Executive Vice President

                                      -6-

<PAGE>

                                         HORIZON VESSELS, INC.

                                         By:
                                             ----------------------------------
                                             David W. Sharp
                                             Executive Vice President

                                         AGENT:

                                         SOUTHWEST BANK OF TEXAS, N.A., as Agent

                                         By:
                                             ----------------------------------
                                             Valerie Gibbs
                                             Senior Vice President

                                         LENDERS:

                                         SOUTHWEST BANK OF TEXAS, N.A.

                                         By:
                                             ----------------------------------
                                             Valerie Gibbs
                                             Senior Vice President

                                         DRESDNER BANK AG, NEW YORK AND
                                         GRAND CAYMAN BRANCHES

                                         By:
                                             ----------------------------------
                                         Name:
                                               --------------------------------
                                         Title:
                                               --------------------------------

                                         By:
                                             ----------------------------------
                                         Name:
                                               --------------------------------
                                         Title:
                                               --------------------------------

                                      -7-

<PAGE>

                                         BANK OF SCOTLAND

                                         By:
                                             ----------------------------------
                                             Joseph Fratus
                                             First Vice President

                                         HIBERNIA NATIONAL BANK

                                         By:
                                             ----------------------------------
                                             Tammy Boyd
                                             Vice President

                                      -8-

<PAGE>

                                         COASTAL BANC SSB

                                         By:
                                             ----------------------------------
                                             Joe M. Peddy
                                             Senior Vice President

         The undersigned Guarantor (a) hereby consents and agrees to this
Amendment, (b) agrees that all references to the Loan Agreement contained in the
Guaranty Agreement-Guarantor executed by Guarantor shall constitute references
to such Loan Agreement as amended by the Amendment and as the same may be
further amended, and (c) agrees that the Guaranty Agreement-Guarantor executed
by Guarantor shall remain in full force and effect and shall continue to be the
legal, valid and binding obligations of Guarantor, enforceable against Guarantor
in accordance with its terms and shall evidence Guarantor's guaranty of the
Notes as renewed and extended from time to time.

                                         HORIZON OFFSHORE, INC.

                                         By:
                                             ----------------------------------
                                             David W. Sharp
                                             Executive Vice President

                                      -9-

<PAGE>

         Each of the undersigned Additional Guarantors (a) hereby consents and
agrees to this Amendment, (b) agrees that all references to the Loan Agreement
contained in the Guaranty Agreement executed by such Additional Guarantor shall
constitute references to such Loan Agreement as amended by the Amendment and as
the same may be further amended, and (c) agrees that the Guaranty Agreement
executed by such Additional Guarantor shall remain in full force and effect and
shall continue to be the legal, valid and binding obligations of such Additional
Guarantor, enforceable against such Additional Guarantor in accordance with its
terms and shall evidence such Additional Guarantor's guaranty of the Notes as
renewed and extended from time to time.

                                       Additional Guarantors:
                                       ---------------------

                                       PROGRESSIVE PIPELINE CONTRACTORS, INC.
                                       AFFILIATED MARINE CONTRACTORS, INC.
                                       TEXAS OFFSHORE CONTRACTORS CORP.
                                       FLEET PIPELINE SERVICES, INC.
                                       GULF OFFSHORE CONSTRUCTION, INC.
                                       BAYOU MARINE CONTRACTORS, INC.

                                       By:
                                          -------------------------------------
                                          David W. Sharp
                                          Executive Vice President

                                       HORIZON GROUP L.D.C.

                                       By:
                                          -------------------------------------
                                          David W. Sharp
                                          Director

                                       HORIZON OFFSHORE NIGERIA LTD.

                                       By:
                                          -------------------------------------
                                          David W. Sharp
                                          Director

                                      -10-

<PAGE>

                                       TIBURON INGENIERIA Y CONSTRUCCION, S. DE
                                       R.L. DE C.V.

                                       By:
                                          -------------------------------------
                                          David W. Sharp
                                          Secretary

                                       HORIZON VESSELS INTERNATIONAL LTD.

                                       By:
                                          -------------------------------------
                                          David W. Sharp
                                          Vice President

                                       PT HORIZON INDONESIA

                                       By:
                                          -------------------------------------
                                          David W. Sharp
                                          Commissioner

                                       HORIZON OFFSHORE INTERNATIONAL LTD.

                                       By:
                                          -------------------------------------
                                          David W. Sharp
                                          Executive Vice President

                                       HORIZON MARINE CONSTRUCTION LTD.

                                       By:
                                          -------------------------------------
                                          David W. Sharp
                                          Executive Vice President

                                      -11-

<PAGE>
                                       HORIZON OFFSHORE PTE. LTD.

                                       By:
                                          -------------------------------------
                                          David W. Sharp
                                          Director

                                       HORIZON OFFSHORE CONTRACTORS
                                       (MAURITIUS) LTD.

                                       By:
                                          -------------------------------------
                                          David W. Sharp
                                          Director

                                       HORIZON MARINE CONSTRUCTION
                                       (MAURITIUS) LTD.

                                       By:
                                          -------------------------------------
                                          David W. Sharp
                                          Director

                                       HORIZON C-BAY COSTA AFUERA, S. DE
                                       R.L. DE C.V.

                                       By:
                                          -------------------------------------
                                          David W. Sharp
                                          Member

                                       HOC OFFSHORE, S. DE R.L. DE C.V.

                                       By:
                                          -------------------------------------
                                          David W. Sharp

                                       Title:
                                              ---------------------------------

                                      -12-

<PAGE>

                                       PT ARMANDI PRANAUPAYA

                                       By:
                                          -------------------------------------
                                          David W. Sharp
                                          Director

                                       ECH OFFSHORE, S. DE R.L. DE C.V.

                                       By:
                                          -------------------------------------
                                          Bill J. Lam
                                          Sole Manager

                                       HORIZON MARINE CONTRACTORS
                                       (MALAYSIA) SDN BHD

                                       By:
                                          -------------------------------------
                                          David W. Sharp
                                          Director

                                       HORIZON OFFSHORE SERVICES, LTD.

                                       By:
                                          -------------------------------------
                                          David W. Sharp
                                          Executive Vice President and Chief
                                          Financial Officer

                                      MARINE LEASING (LABUAN) PTE LTD

                                       By:
                                          -------------------------------------
                                          David W. Sharp
                                          Executive Vice President and Chief
                                          Financial Officer

                                      -13-

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