Document:

Exhibit 10.43

       INTERVENTION OF GRUPO INDUSTRIAL ATLANTIDA SA DE CV INTO THE MASTER
             ASSUMPTION AGREEMENT, SUPPLEMENTAL INDENTURE NO. 1 AND
                    AMENDMENT TO TITLE XI FINANCE AGREEMENTS

         This Intervention of Grupo Industrial Atlantida, S.A. de C.V. into the
Master Assumption Agreement, Supplemental Indenture No. 1 and Amendment to XI
Finance Agreements, by and among:

         Grupo Industrial Atlantida S.A. de C.V. (hereinafter referred to as
"GIA"), the United States of America, represented by the Secretary of
Transportation, acting by and through the Maritime Administrator (hereinafter
referred to as the "Secretary") and Bank One Trust Company, N.A., a national
banking association, successor to First National Bank of Commerce (said bank,
its successor or assign, herein called the "Indenture Trustee"), is dated as of
June 6, 2001.

                                   WITNESSETH:

         WHEREAS, Perforadora Central, S.A. DE C.V., a Mexican corporation
(hereinafter referred as the "Original Shipowner") by partition transferred the
LeTourneau Design Super 116 C Jack-up Drilling Unit named TONALA (the "Vessel")
to PC 2 S.A. de C.V. ("PC 2") on March 9, 2001;

         WHEREAS, pursuant to the Master Assumption Agreement, Supplemental
Indenture No. 1 and Amendment to Title XI Finance Agreements dated March 9, 2001
(the "Master Assumption Agreement") (Capitalized terms used herein which are
defined in the Master Assumption Agreement shall have the same meaning when used
herein) by and between the Original Shipowner, PC 2, the Secretary and the
Indenture Trustee, the transfer of the Vessel was approved and accepted and PC 2
assumed the rights, obligations and duties of the Original Shipowner to the
Indenture and Title XI Finance Agreements;

         WHEREAS, PC 2 has executed a First Supplemental Endorsement to
Secretary's Note and an Assumption Agreement and Supplement No. 1 to First
Preferred Ship Mortgage on March 9, 2001 assuming the rights, obligations and
duties of the Original Shipowner under the Secretary's Note and Mortgage;

         WHEREAS, GIA desires to take possession and ownership of the Vessel
from PC 2 and desires to intervene into the Master Assumption Agreement so as to
assume the rights, obligations, and duties of PC 2;

         NOW, THEREFORE, in consideration of the premises the mutual agreements,
hereinafter set forth and other good and valuable consideration, the receipt and
adequacy of which are hereby acknowledged, the parties hereto agree as follows:

         Simultaneously with the execution and delivery of this Intervention,
GIA hereby intervenes in and assumes all rights, obligations, and duties and
extends and restates all representations and warranties of PC 2 as set forth on
the Master Assumption Agreement attached hereto and incorporated by reference;

<PAGE>

         The parties further agree that simultaneously with the execution of
this Intervention by the parties hereto, GIA shall execute and deliver to the
Secretary a Second Supplemental Endorsement to the Secretary's Note and shall
execute and deliver to the Secretary an Assumption Agreement and Supplement
No. 2 to First Preferred Ship Mortgage to be filed for recordation with the
Republic of Panama on the date first above written;

         The parties further agree that once the parties have fully executed
this Intervention, GIA shall be bound under the Master Assumption Agreement, the
Secretary's Note and the Mortgage to the same extent and on the same terms and
conditions as PC 2; provided, however, that the Original Shipowner remains
liable for the timely payment of all sums due under the Secretary's Note, as
amended through the date hereof.

         IN WITNESS WHEREOF, this agreement has been duly executed and delivered
by the parties as of the day and year first above written.

<PAGE>

ATTEST:                                    Grupo Industrial Atlantida SA DE CV

/s/ AMANDO RODRIGUEZ VILLEGAS              BY: /s/ JORGE VILLALPANDO BORREGO
-----------------------------                 ------------------------------
AMANDO RODRIGUEZ VILLEGAS                     JORGE VILLALPANDO BORREGO
                                              Vice President

ATTEST:

/s/ PATRICIA E. BYRNE                      BY: /s/ JOEL C. RICHARD
-----------------------------                 ------------------------------
PATRICIA E. BYRNE                             JOEL C. RICHARD
Assistant Secretary                           Secretary, Maritime Administration

ATTEST:                                        BANK ONE TRUST COMPANY,  N.A.

/s/ DENIS L. MILLINER                      BY: /s/ TIMOTHY C. BRENNAN
-----------------------------                 ------------------------------
Name: Denis L. Milliner                       Timothy C. Brennan
      Assistant Secretary                     Regional Account Executive and
                                              Authorized Officer

<PAGE>

                                 ACKNOWLEDGMENT

DISTRICT OF COLUMBIA

CITY OF WASHINGTON

         I, the undersigned, a Notary Public in and for the District of
Columbia, do hereby certify that Joel C. Richard, Secretary, Maritime
Administrator, personally appeared before me in said District, executed the
foregoing instrument, in his official capacity and acknowledges this act as said
officer of the Maritime Administration.

  Given under my hand and seal this 30th day of April, 2001.

SWORN TO AND SUBSCRIBED BEFORE
ME THIS 30TH DAY OF APRIL,
2001.

      /s/ MELINDA M. ALLEN
-------------------------------------
           NOTARY PUBLIC

<PAGE>

                                 ACKNOWLEDGMENT

STATE OF LOUISIANA

PARISH OF ORLEANS

    On this 3rd day of May, 2001, before me appeared:

                               Timothy C. Brennan

to me personally known, who, being by me duly sworn, did say that he is an
Regional Account Executive and Authorized Officer of Bank One Trust Company,
N.A., one of the corporations described in and which executed the foregoing
instrument, and that the seal affixed to such instrument is the corporate seal
of such corporation and that such instrument was signed and sealed on behalf of
such corporation by authority of the Board of Directors and he acknowledged such
instrument to be the free act and deed of such corporation.

                                                /s/ TIMOTHY C. BRENNAN
                                             ----------------------------------
                                             Timothy C. Brennan

SWORN TO AND SUBSCRIBED BEFORE
ME THIS 3RD DAY OF MAY,
2001.

     /s/  SERGIO J. ALACON
-------------------------------------
            NOTARY PUBLICExhibit 10.44

            INTERVENTION OF GIA 2 SA DE CV INTO THE MASTER ASSUMPTION
                   AGREEMENT, SUPPLEMENTAL INDENTURE NO. 1 AND
                    AMENDMENT TO TITLE XI FINANCE AGREEMENTS

         This Intervention of GIA 2 SA DE CV into the Master Assumption
Agreement, Supplemental Indenture No. 1 and Amendment to XI Finance Agreements,
by and among

         GIA 2 S.A. de C.V., a Mexican corporation ("GIA 2"), the United States
of America, represented by the Secretary of Transportation, acting by and
through the Maritime Administrator (hereinafter referred to as the "Secretary")
and Bank One Trust Company N.A., a national banking association (said bank, its
successor or assign, herein called the "Indenture Trustee"), is dated as of
June 6, 2001.

                                   WITNESSETH:

         WHEREAS, Perforadora Central, S.A. DE C.V., a Mexican corporation
(hereinafter referred as the "Original Shipowner") by partition transferred the
LeTourneau Design Super 116 C Jack-up Drilling Unit named TONALA (the "Vessel")
to PC 2 S.A. de C.V. ("PC 2") on March 9, 2001;

         WHEREAS, pursuant to the Master Assumption Agreement, Supplemental
Indenture No. 1 and Amendment to Title XI Finance Agreements dated March 9, 2001
(the "Master Assumption Agreement") (Capitalized terms used herein which are
defined in the Master Assumption Agreement shall have the same meaning when used
herein) by and between the Original Shipowner, PC 2, the Secretary and the
Indenture Trustee, the transfer of the Vessel was approved and accepted and PC 2
assumed the rights, obligations and duties of the Original Shipowner to the
Indenture and Title XI Finance Agreements;

         WHEREAS, pursuant to an Intervention dated June 6, 2001, GIA intervened
into the Master Assumption Agreement;

         WHEREAS, PC 2 and GIA have executed a Second Supplemental Endorsement
to Secretary's Note and an Assumption Agreement and Supplement No. 2 to First
Preferred Ship Mortgage assuming the rights, obligations and duties of the
Original Shipowner under the Secretary's Note and Mortgage;

         WHEREAS, GIA 2 desires to take possession and ownership of the Vessel
from GIA and desires to intervene into the Master Assumption Agreement so as to
assume the rights, obligations, and duties of PC 2 and subsequent intervenors
into that instrument;

         NOW, THEREFORE, in consideration of the premises the mutual agreements,
hereinafter set forth and other good and valuable consideration, the receipt and
adequacy of which are hereby acknowledged, the parties hereto agree as follows:

<PAGE>

         Simultaneously with the execution and delivery of this Intervention,
GIA 2 hereby intervenes in and assumes all rights, obligations, and duties and
extends and restates all representations and warranties of PC 2 and GIA as set
forth in the Master Assumption Agreement attached hereto and incorporated herein
by reference, and in the Interventions thereto;

         The parties further agree that simultaneously with the execution of
this Intervention by the parties hereto, GIA 2 shall execute and deliver to the
Secretary a Third Supplemental Endorsement to the Secretary's Note and shall
execute and deliver to the Secretary an Assumption Agreement and Supplement
No. 3 to First Preferred Ship Mortgage to be filed for recordation with the
Republic of Panama on the date first above written;

         The parties further agree that once the parties have fully executed
this Intervention, GIA 2 shall be bound under the Master Assumption Agreement,
the Secretary's Note and the Mortgage to the same extent and on the same terms
and conditions as PC 2 and GIA; provided however, that the Original Shipowner
remains liable for the timely payment of all sums due under the Secretary's
Note, as amended through the date hereof.

         IN WITNESS WHEREOF, this agreement has been duly executed and delivered
by the parties as of the day and year first above written.

ATTEST:                                  GIA 2 SA DE CV

/s/ AMANDO RODRIGUEZ VILLEGAS            BY: /s/ JORGE VILLALPANDO BORREGO
------------------------------              ----------------------------------
Amando Rodriguez Villegas                   Jorge Villalpando Borrego
Assistant Secretary                         Vice President

ATTEST:                                  UNITED STATES OF AMERICA
                                         SECRETARY OF TRANSPORTATION

/s/ PATRICIA E. BYRNE                    BY: /s/ JOEL C. RICHARD
-------------------------------             ----------------------------------
PATRICIA E. BYRNE                           JOEL C. RICHARD
Assistant Secretary                         Secretary, Maritime Administration

ATTEST:                                  BANK ONE TRUST COMPANY, N.A.

/s/ DENIS L. MILLINER                    BY: /s/ TIMOTHY C. BRENNAN
-------------------------------             ----------------------------------
Name: Denis L. Milliner                     Name: Timothy C. Brennan
Title:                                      Title:  Regional Account Executive
                                                    And Authorized Officer

<PAGE>

                                 ACKNOWLEDGMENT

                              DISTRICT OF COLUMBIA

                               CITY OF WASHINGTON

         I, the undersigned, a Notary Public in and for the District of
Columbia, do hereby certify that Joel C. Richard, Secretary, Maritime
Administrator, personally appeared before me in said District, executed the
foregoing instrument in his official capacity and acknowledges this act as said
officer of the Maritime Administration.

  Given under my hand and seal this 30th day of April, 2001.

                         SWORN TO AND SUBSCRIBED BEFORE
                           ME THIS 30TH DAY OF APRIL,
                                      2001.

                      /s/ MELINDA M. ALLEN
                      -------------------------------------
                                  NOTARY PUBLIC

<PAGE>

                                 ACKNOWLEDGMENT

                               STATE OF LOUISIANA

                               PARISH OF ORLEANS

    On this 3rd day of May, 2001, before me appeared:

                               Timothy C. Brennan

         to me personally known, who, being by me duly sworn, did say that he is
a Regional Account Executive and Authorized Officer of Bank One Trust
Association, N.A., one of the corporations described in and which executed the
foregoing instrument, and that the seal affixed to such instrument is the
corporate seal of such corporation and that such instrument was signed and
sealed on behalf of such corporation by authority of the Board of Directors and
he acknowledged such instrument to be the free act and deed of such corporation.

                   /s/ TIMOTHY C. BRENNAN
                   ------------------------------------------
                               Timothy C. Brennan

                         SWORN TO AND SUBSCRIBED BEFORE
                            ME THIS 3rd DAY OF MAY,
                                      2001.

                      /s/ SERGIO J. ALACON
                      -------------------------------------
                                  NOTARY PUBLIC

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