Document:

<PAGE>

                                                           Ex-10.23

                               Schedules to

                            Atlantic Cable and

                             Maintenance Agent

<PAGE>

                                                                      Schedule B

Procedures for the Derivation of Accounting Units for Scheduled Cables

This Schedule B provides procedures for the derivation of Accounting Units for
analogue and fibre-optic Scheduled Cables. Accounting Units for each Scheduled
Cable and the percentage shares of Accounting Units for each Maintenance
Authority are shown in Schedule B1 and Schedule B2 annexed to this Schedule B.
Accounting Units for analogue and fibre-optic Scheduled Cables are based on the
procedures contained in this Schedule B and Schedules B1 and B2 are prepared in
accordance with Article 13.

1     Accounting Unit Components and Formulae

      1.1   Accounting Unit Components

      1.1.1 The Accounting Units for analogue and fibre-optic Scheduled Cables
      are derived using the formulae contained in Paragraphs 1.2 and 1.3 of this
      Schedule B.

      1.1.2 The formulae comprise one or more of the following components:

      L =   total length of a Scheduled Cable in nautical miles.

      S =   (i) for the Eastern Zone, the number of nautical miles of a
            Scheduled Cable which lie south of that point on such Scheduled
            Cable which is 2000 (two thousand) nautical miles south from Vigo
            or, if pursuant to this Agreement a Base Port is established further
            south than Vigo, 2000 (two thousand) nautical miles south from such
            Base Port;

            (ii) for the Western Zone, the number of nautical miles of a
            Scheduled Cable which lie south of that point on such Scheduled
            Cable which is 2000 (two thousand) nautical miles south from Bermuda
            or, if pursuant to this Agreement a Base Port is established further
            south than Bermuda, 2000 (two thousand) nautical miles south from
            such Base Port;

      Na =  number of circuits in use by an analogue Scheduled Cable.

      For an analogue Scheduled Cable which contains both international and
      non-international circuits and which is owned and operated by one
      Maintenance Authority and where:

            x   =   number of international circuits in use; and

            y   =   number of non-international circuits in use; then

            Na  =   (x/y)

Schedule B                                                          Page 1 of 10
--------------------------------------------------------------------------------
<PAGE>

            Aa =  Accounting Units for an analogue Scheduled Cable carrying only
                  international circuits.

            Ba =  Accounting Units for an analogue Scheduled Cable carrying only
                  non-international circuits and owned and operated by one
                  Maintenance Authority.

            Ca =  Accounting Units for an analogue Scheduled Cable carrying both
                  international and non-international circuits and owned and
                  operated by one Maintenance Authority.

            Da =  Accounting Units for an analogue Scheduled Cable containing a
                  section "S".

            Af =  Accounting Units a for a fibre-optic Scheduled Cable.

            Df =  Accounting Units for a fibre-optic Scheduled Cable containing
                  a section "S".

            Afm = Accounting Units for a fibre-optic Scheduled Cable which has
                  introduced additional Notional Capacity.

            Dfm = Accounting Units for a fibre-optic Scheduled Cable containing
                  a section "S" and which has introduced additional Notional
                  Capacity.

            MAUO = Minimum Assignable Unit of Ownership consisting of 64,000
                  usable bits per second or such other standard as the CCITT may
                  adopt and the Management Committee may agree.

            NC =  The value of the Notional Capacity of a fibre-optic Scheduled
                  Cable at the date of its introduction into this Agreement or a
                  previous ACMA agreement, and which is expressed in MAUOs.

            NC1 = The amount of NC which is less than or equal to BP1 MAUOs.

            NC2 = The amount of NC which is greater than BP1 MAUOs but less than
                  or equal to BP2 MAUOs.

            NC3 = The amount of NC which is greater than BP2 MAUOs.

            The actual values of BP1 and BP2 are as shown in the table below.

--------------------------------------------------------------------------------
AGREEMENT YEAR                1998             1999            2000
--------------------------------------------------------------------------------
BP1                           40000            27500           15000
--------------------------------------------------------------------------------
BP2                           50000            37500           25000
--------------------------------------------------------------------------------

Schedule B                                                          Page 2 of 10
--------------------------------------------------------------------------------
<PAGE>

            NCa, NCb, NCc,.....NCn = the incremental amounts of Notional
            Capacity added to a Scheduled Cable on successive occasions.

            NC1A, NC2A, NC3A; NC1B, NC2B, NC3B;.....NC1n, NC2n, NC3n = the
            parameters associated with the above incremental amounts of Notional
            Capacity added to a Scheduled Cable on successive occasions and
            which are calculated in accordance with paragraph 3.3.2.3 of this
            Schedule B.

            Fill Factor (or "FF") = a percentage factor used to approximate the
                                    actual utilisation of a fibre-optic
                                    Scheduled Cable.

            FF1                   = Fill Factor applicable to the Notional
                                    Capacity of a fibre-optic Scheduled Cable at
                                    its date of introduction into this
                                    Agreement.

            FF2, FF3,...FFn       = Fill Factors applicable to additional
                                    Notional Capacity added to a Scheduled Cable
                                    on successive occasions.

1.1.3 Fill Factors shall be as shown in the tables below and shall be applied on
the basis of the number of years of service applicable to a fibre-optic
Scheduled Cable at its date of introduction into this Agreement. Where the
Notional Capacity of a fibre-optic Scheduled Cable is not expected to be
fully-utilised within seven years, the ten-year fill factors may, with the
approval of the Management Committee, be used. In all other cases the seven-year
fill factors shall be used.

                               Seven-Year Fill Factors
                               -----------------------
                     Years of Service            Fill Factor
                     ----------------            -----------

                Early entry up to RFS Date          0
                RFS Date up to 1                    0.30
                1-2                                 0.50
                2-3                                 0.65
                3-4                                 0.75
                4-5                                 0.85
                5-6                                 0.95
                6-7                                 1.00

Schedule B                                                          Page 3 of 10
--------------------------------------------------------------------------------
<PAGE>

                               Ten-Year Fill Factors
                               ---------------------
                     Years of Service            Fill Factor
                     ----------------            -----------
                Early entry up to RFS Date         0
                RFS Date up to 1                   0.19
                1-2                                0.28
                2-3                                0.37
                3-4                                0.46
                4-5                                0.55
                5-6                                0.64
                6-7                                0.73
                7-8                                0.82
                8-9                                0.91
                9-10                               1.00

1.2   Derivation of Accounting Units for Analogue Scheduled Cables

1.2.1 The Accounting Units for an analogue Scheduled Cable shall be derived
using the relevant formula selected from the following formulae:

      1.2.1.1 For a Scheduled Cable carrying only international circuits:

      Accounting Units. Aa = ((L/3)+((Na*L)/l000))

      1.2.1.2 For a Scheduled Cable carrying only non-international circuits,
      and owned and operated by one Maintenance Authority:

      Accounting Units. Ba = (Aa/3)

      1.2.1.3 For a Scheduled Cable carrying both international and
      non-international circuits, and which is owned and operated by one
      Maintenance Authority:

      Accounting Units. Ca = ((x+(y/3))*Aa/Na)

      1.2.1.4 For a Scheduled Cable containing a Section S:

      Accounting Units. Da = Aa-(0.5*(S/3+(Na*S/1000)))

Schedule B                                                          Page 4 of 10
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<PAGE>

1.3   Derivation of Accounting Units for Fibre-Optic Scheduled Cables

1.3.1 The Accounting Units for a fibre-optic Scheduled Cable shall be derived by
using the relevant formula selected from the following formulae:

      1.3.1.1 For a Scheduled Cable not containing a Section "S":

      Accounting Units. Af =

          L*(1+(((FF1*NC1)+(FF1*NC2*0.1)+(FF1*NC3*0.05))/725))

      1.3.1.2 For a Scheduled Cable containing a Section "S":

      Accounting Units. Df =

          Af-((S/2)(1+(((FF1*NCI)+(FF1*NC2*0.1)+(FF1*NC3*0.05))/725)))

2     Procedures for Updating Schedules B1 and B2

      2.1   General

      2.1.1 In accordance with Article 13, Schedules B1 and B2 shall be revised
      and re-issued quarterly by the Schedule B Party. The re-issued Schedules
      B1 and B2 shall reflect the Accounting Units in effect for that particular
      quarter.

      2.1.2 There shall be only one Schedule B1 and one Schedule B2 in effect
      for any one quarter.

      2.1.3 Where a Scheduled Cable has more than one Maintenance Authority
      and/or segment, the Accounting Units relevant to each Maintenance
      Authority and/or segment shall be displayed separately on Schedule B1
      and/or B2, as appropriate.

      2.1.4 Each Maintenance Authority shall, for any Scheduled Cable for which
      they have Maintenance Authority responsibility, submit to the Schedule B
      Party written notification of any planned changes which affect billing and
      which are planned to take effect during the next quarter. This
      notification shall be sent via fax by the 15th day of the month preceding
      the month when the Schedule B1 and/or B2 is due to be sent to the Central
      Billing Party (ie 15 October for the 1st quarter; 15 January for the 2nd
      quarter; 15 April for the 3rd quarter; and 15 July for the 4th quarter.
      Examples of such changes include but are not limited to: Scheduled Cable
      additions, Scheduled Cable retirements and changes in Notional Capacity.

Schedule B                                                          Page 5 of 10
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<PAGE>

      2.1.5 In those cases where such changes referred to in paragraph 2.1.4 of
      this Schedule B are submitted to the Schedule B Party on or before the
      dates listed above, the Schedule B Party shall incorporate these changes
      in the Schedule B1 and/or B2 which is submitted to the Central Billing
      Party for the following quarter, (ie by 1 November for the 1st quarter; by
      1 February for the 2nd quarter; by 1 May for the 3rd quarter; and by 1
      August for the 4th quarter).

      2.1.6 In those cases where such chances referred to in paragraph 2.1.4 of
      this Schedule B are submitted to the Schedule B Party after the required
      dates, the Schedule B Party shall incorporate such changes in the next
      issue of Schedule B1 and/or B2 to that indicated in paragraph 2.1.5 of
      this Schedule B.

      2.1.7 If such a planned change actually occurs on a date different to the
      one estimated in the original written notification to the Schedule B Party
      pursuant to paragraph 2.1.4 of this Schedule B, the Maintenance Authority
      shall so notify the Schedule B Party as soon as possible, in writing, of
      the original planned date specified and the date that the change actually
      occurred. The Schedule B Party shall prepare a revised Schedule B1 and/or
      B2, indicating the correction and shall submit this to the Central Billing
      Party. The Schedule B Party shall also notify the Central Billing Party of
      any changes which affect billing and which have been sent to the Schedule
      B Part after the fact. The Central Billing Party shall use this
      information to make any required adjustments to the billing. Such
      adjustments shall take place once per Agreement Year, in June.

      2.2   Analogue Scheduled Cables

      2.2.1 Within one month after 1 January and 1 July in each Agreement Year,
      the relevant Maintenance Authority shall inform the Schedule B Party of
      the number of bearer circuits normally in use on such dates for each
      analogue Scheduled Cable for which it is responsible. If such information
      is not received on the due date, the Schedule B Party shall use its best
      judgement to estimate the appropriate number of circuits.

      2.2.2 Based on such information so received or estimated, the Schedule B
      Party shall update the Accounting Units in Schedule B1 and/or B2 for each
      analogue Scheduled Cable in accordance with the formulae in this Schedule
      B.

      2.3   Fibre-Optic Scheduled Cables

      2.3.1 On 1 January in each Agreement Year, the Fill Factor for each
      fibre-optic Scheduled Cable shall be updated by means of annual
      incremental progression in accordance with the tables included in
      paragraph 1.1.3 of this Schedule B.

Schedule B                                                          Page 6 of 10
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<PAGE>

      2.3.2 Notwithstanding the provisions of paragraph 2.3.1 of this Schedule
      B, for a Scheduled Cable which is introduced into this Agreement and which
      has a RFS Date which lies between 1 January and 30 June inclusive, the
      Fill Factor for such Scheduled Cable shall be updated in Schedule B1
      and/or B2 on the 1 January following the introduction of such Scheduled
      Cable into this Agreement. Thereafter, Schedule B1 and/or B2 shall be
      updated on an annual basis in accordance with the provisions of paragraph
      2.3.1 of this Schedule B.

      2.3.3 Notwithstanding the provisions of paragraph 2.3.l of this Schedule
      B, for a Scheduled Cable which is introduced into this Agreement and which
      has a RFS Date which lies between 1 July and 31 December inclusive, the
      Fill Factor for such Scheduled Cable shall not be updated in Schedule B1
      and/or B2 until the 1 January following the anniversary of such Scheduled
      Cable's RFS Date. Thereafter, Schedule B1 and/or B2 shall be updated on an
      annual basis in accordance with the provisions of paragraph 2.3.1 of this
      Schedule B.

3     Introduction of Scheduled Cables or Additional Capacity into the Agreement

      Procedures for introducing a Scheduled Cable or additional Notional
      Capacity into Schedule B1 and/or B2 shall be as follows.

      3.1   General Procedures

      3.1.1 A Notional Capacity figure must be provided by any Maintenance
      Authority entering a fibre-optic Scheduled Cable or additional Notional
      Capacity into this Agreement. For a Scheduled Cable not having a specified
      notional capacity, the Notional Capacity shall be as agreed between the
      Management Committee and the relevant Maintenance Authority taking into
      account:

      (i) the total quantity of Bearer Capacity available on such Scheduled
      Cable less an amount of Bearer Capacity for restoration purposes; and

      (ii) the capacity fill profile of other Scheduled Cables of similar
      capacity and route.

      3.1.2 Upon notification by the Maintenance Authority, to the chairman of
      the Management Committee, of its intention to enter a Scheduled Cable or
      additional Notional Capacity into this Agreement, its date of introduction
      and other required system information, Schedule B1 and/or B2 shall be
      amended by the Schedule B Party effective as of the first day of the
      quarter following receipt of such notification. Any necessary billing
      adjustments for the quarter in which such Scheduled Cable or additional
      Notional Capacity is introduced shall be calculated by the Central Billing
      Party and adjustments made at the same time as the annual adjustment
      mentioned in paragraph 2.1.7 of this Schedule B.

Schedule B                                                          Page 7 of 10
--------------------------------------------------------------------------------
<PAGE>

      3.2   Analogue Cable Systems

      3.2.1 For an analogue Scheduled Cable, the number of circuits included in
      the Accounting Unit formula shall be deemed to be equal to zero for those
      billing periods occurring from the date of introduction of such Scheduled
      Cable into this Agreement until the next scheduled count of the number of
      circuits in use pursuant to paragraph 2.2.1 of this Schedule B.

      3.2.2 Pursuant to paragraph 3.2.1 of this Schedule B, the Accounting Units
      for such Scheduled Cable for such specified period shall be based solely
      on the total length of such Scheduled Cable in nautical miles using the
      relevant formula selected from the following formulae.

            3.2.2.1 For a Scheduled Cable carrying only international circuits:

            Accounting Units. Aa = (L/3)

            3.2.2.2 For a Scheduled Cable carrying only non-international
            circuits, and owned and operated by one Maintenance Authority:

            Accounting Units. Ba = (L/9)

            3.2.2.3 For a Scheduled Cable carrying both international and
            non-international circuits, and which is owned and operated by one
            Maintenance Authority

            Accounting Units. Ca=(L/4.5)

      3.3   Fibre-Optic Cable Systems

      3.3.1 Introduction of a Scheduled Cable

            3.3.1.1 When a Scheduled Cable is introduced into this Agreement,
            the Accounting Unit formula shall include the Fill Factor applicable
            at such date of introduction.

            3.3.1.2 Pursuant to Article 2.9, if a cable system is brought into
            this Agreement as a Scheduled Cable prior to its RFS Date, the
            Accounting Unit formula shall include a Fill Factor of zero from the
            date of such introduction until the RFS Date of such Scheduled Cable
            when the normal Fill Factor shall be applied in accordance with the
            the tables included in paragraph 1.1.3 of this Schedule B.
            Thereafter, the Fill Factor for such Scheduled Cable shall be
            up-dated in accordance with paragraph 2.3 of this Schedule B.

Schedule B                                                          Page 8 of 10
--------------------------------------------------------------------------------
<PAGE>

      3.3.2 The Introduction of Additional Capacity

            3.3.2.1 When the capacity of a Scheduled Cable is expanded, the
            Notional Capacity of the such Scheduled Cable shall be adjusted to
            include the new capacity.

            3.3.2.2 Following the introduction of additional Notional Capacity
            to a Scheduled Cable, the Accounting Units shall be derived by using
            the relevant formula selected from the following formulae:

            for a Scheduled Cable not containing a Section "S":

            Accounting Units. Afm =

            L * (1 + (((FF1 * NC1) + (FF1 * NC2 * 0.1) + (FF1 * NC3 * 0.05) +
            (FF2 * NC1A) + (FF2 * NC2A * 0.1) + (FF2 * NC3A * 0.05) +....
            ...(FFn * NC1n) + (FFn * NC2n * 0.1) + (FFn * NC3n * 0.05))/725))

            for a Scheduled Cable containing a Section "S":

            Accounting Units. Dfm =

            Afm-((S/2)*(1+(((FFl * NC1)+(FF1 * NC2 * 0.1)+(FF1 * NC3 * 0.05)+
            (FF2 * NC1A) + (FF2 * NC2A * 0.1) +/- (FF2 * NC3A * 0.05) +...
            ...(FFn * NC1n) + (FFn * NC2n * 0.1) + (FFn * NC3n * 0.05))/725)))

            3.3.2.3 For the avoidance of doubt, the parameters NC1A, NC2A and
            NC3A shall be determined by reference to the following table:

--------------------------------------------------------------------------------
   If NC is:            and          then NC1A =      and NC2A =     and NC3A =
                   (NC+NCa) is:
--------------------------------------------------------------------------------
less than BP1     greater than= BP2       NCa             0               0
--------------------------------------------------------------------------------
less than BP1  greater than BP1 but less than= BP2  BP1-NC (NC+NCa)-BP1    0
--------------------------------------------------------------------------------
less than BP1    greater than BP2   BP1-NC   BP2-BP1     (NC+NCa)-BP2
--------------------------------------------------------------------------------
greater than BP1 but less than BP2   less than = BP2     0      NCa          0
--------------------------------------------------------------------------------
greater than BP1 but less tahn BP2  greater than BP2    0   BP2-NC  (NC+NCa)-BP2
--------------------------------------------------------------------------------
greater than = BP2  greater than BP2       0                0             NCa
--------------------------------------------------------------------------------

            The principles embodied in the above table, with the necessary
            changes, shall be followed when calculating the parameters NC1B,
            NC2B, NC3B, NC1n, NC2n, NC3n, for successive incremental additions
            of Notional Capacity.

Schedule B                                                          Page 9 of 10
--------------------------------------------------------------------------------
<PAGE>

4     Scheduled Cables Withdrawn from Service and Reduction of Notional Capacity

      4.1   Scheduled Cable Withdrawn from Service

      4.1.1 When a Scheduled Cable is withdrawn from service, the Maintenance
      Authority responsible shall inform the chairman of the Management
      Committee and the Schedule B Party of the date of withdrawal. The Schedule
      B Party shall amend Schedule B1 and/or B2 by deleting such Scheduled
      Cable. Any necessary billing adjustments for the quarter in which such
      Scheduled Cable is withdrawn shall be calculated by the Central Billing
      Party and adjustments made at the same time as the annual adjustment
      mentioned in paragraph 2.1.7 of this Schedule B.

      4.2   Reduction of Notional Capacity

      4.2.1 There may be circumstances for a fibre-optic Scheduled Cable where
      some capacity might not be usable as a result of a mis-match with
      interconnecting facilities, a condition of isolation due to circuits
      turned back to the owners, or other conditions where the use of such
      capacity is not available to the cable owners. In such circumstances, the
      Maintenance Authority concerned may advise the Management Committee of
      those circumstances where the unavailability is deemed permanent in nature
      and upon approval by the Management Committee, the Notional Capacity shall
      be correspondingly reduced in the Accounting Unit formula.

      4.2.2 If, in accordance with Paragraph 4.2.1 of this Schedule B, the
      Notional Capacity of a Scheduled Cable shall be reduced then Schedule B1
      and/or B2 shall be amended by the Schedule B Party effective as of the
      date agreed by the Management Committee. The Fill Factor for such
      Scheduled Cable shall continue as previously assigned. Any necessary
      billing adjustments for the quarter in which the capacity is reduced will
      be calculated by the Central Billing Party and adjustments made at the
      same time as the annual adjustment mentioned in paragraph 2.1.7 of this
      Schedule B.

                           Schedules Bl and B2 follow.

Schedule B                                                         Page 10 of 10
--------------------------------------------------------------------------------
<PAGE>

                                                                      Schedule F

              CABLE SHIP ANNUAL STANDING CHARGES BY AGREEMENT YEAR

================================================================================
      CABLE SHIP        CURRENCY              STANDING CHARGES FOR
                                                 AGREEMENT YEAR
                                                   (Thousands)
                                         =======================================
                                           1998       1999      2000
================================================================================
BC ATLANTIDA          Pesetas             2142200    2181000   2197600
--------------------------------------------------------------------------------
CS GLOBAL LINK        US $                  22616      22901      23134
--------------------------------------------------------------------------------
CS GLOBAL MARINER     US $                  21970      22267      22486
--------------------------------------------------------------------------------
NC LEON THEVENIN      French Francs         82695      83931      85817
--------------------------------------------------------------------------------
CS SIR ERIC SHARP     (pound) Sterling      10695      10891      11097
--------------------------------------------------------------------------------
CS SOVEREIGN          (pound) Sterling      11577      11466      11632
================================================================================

<PAGE>

                                                                      Schedule J

            CABLE SHIP ESTIMATED RUNNING COSTS FOR REPAIR OPERATIONS

CABLE SHIP:
CABLE SYSTEM AND SEGMENT:
FAULT DATE AND TIME:
FINAL SPLICE DATE AND TIME:

OPERATIONAL DETAILS

NUMBER OF DAYS IN PORT - MOB/DEMOB: XXX
NUMBER OF DAYS ON PASSAGE:          XXX
NUMBER OF DAYS ON CABLE GROUND:     XXX

RUNNING COSTS
                         CURRENCY: XXX
                         EXCHANGE RATE: XXX
                         EXCHANGE RATE DATE: XX/XX/XX

--------------------------------------------------------------
RUNNING COST ITEMS                              ESTIMATED COST
------------------                              --------------

i     Fuel
ii    Lub Oil
iii   Labour Costs
      - Personnel
      - Victualling
iv    At Sea Insurance
v     Port Charges
vi    Cable Handing at Base Port
      - Loading
      - Unloading
vii   Consumables (Average Figure)
      - Includes but not limited to
        Rope
        Jointing Consumables
        Lost Equipment
        Cable Stoppers
viii  Miscellaneous Costs
      - Includes but not limited to
        Operational Communications
        Weather Forecasting Services
        Specialist Navigation Services
        Representatives victualling
                                             -----------------
TOTAL (Ship Operator Currency)
--------------------------------------------------------------
TOTAL (Pounds Stg Equivalent)
--------------------------------------------------------------
<PAGE>

                                                                      Schedule N

                      DOCUMENT OF ADMISSION OF A NEW PARTY

This amendment to the Atlantic Cable Maintenance and Repair Agreement dated 1
January 1998 ("the Agreement") is effective as of this [       ] day of[       ]
19[       ] (the "Effective Date").

WHEREAS, [party's full corporate description and registered address] is a
Maintenance Authority for the [cable system], and desires to become a Party to
the Agreement.

NOW THEREFORE, pursuant to Article 27 of the Agreement, all Parties having
agreed to admission, [party], declaring that the [cable system] has no
service-affecting submerged plant cable faults, is hereby admitted as a Party to
the Agreement on the Effective Date.

As of the Effective Date, [party] agrees that it shall be added as a Party to
Schedule A, and that it shall enjoy all rights and be subject to all obligations
of a Party to the Agreement and the [cable system] shall be included in Schedule
B1 and/or B2, as appropriate.

IN WITNESS WHEREOF, the undersigned, duly authorised, have signed this
amendment.

Chairman, Management Committee for and on behalf of the Parties to the Agreement

_________________________________________   Date:_______________________________

For and on behalf of [party]

_________________________________________   Date:_______________________________<PAGE>

                                                                   Ex-10.24

                                   Schedules to

                                 Mediterannean CMA

<PAGE>

                                   SCHEDULE C

--------------------------------------------------------------------------------

                   CABLESHIP FIXED STANDING CHARGES ALLOCATION

                                AND RUNNING COSTS

<PAGE>

                                                                    SCHEDULE C.1

                           CABLESHIP STANDING CHARGES

"Fixed Standing Charges" include in particular (but are not limited to):

(a)   Depreciation (including depreciation of additions and improvements of a
      capital nature) calculated in accordance with the projected life of the
      Cableship depreciated to nil at the end of the Cableships' book life, or
      such shorter periods as may be consistent with the book lives of
      individual items of plant or machinery.

(b)   Interest calculated in accordance with the relevant financial terms and
      conditions.

(c)   The cost of repairs to the Cableship and its equipment and any essential
      renewals of its equipment, including the cost of non-capital improvements
      to the Cableship to enable it to fulfill its commitments in relation to
      changes in the design of submersible plant and repair techniques.

(d)   The costs of refit.

(e)   The costs of crew training.

(f)   The salaries, wages and allowances of the personnel and crew required to
      operate the Cableship.

(g)   The cost of providing victuals, water, stores and other services to each
      Cableship Operator's normal standards.

(h)   The cost of port charges and agency fees together with an appropriate
      share of the Assigned Port charges, agency fees and associated
      headquarters charges but excluding the costs of any cable and repeater
      storage ashore, and

(i)   The cost of insurance, except "at sea" insurance (which is included in
      Running Costs) against such risks as the Cableship Operator decides to
      insure by contract.

                                      C-1
<PAGE>

                                                                    SCHEDULE C.2

                             CABLESHIP RUNNING COSTS

The Cableship Running Costs comprise the additional costs, incurred over and
above the Fixed Standing Charges, which are incurred in respect of Repair,
Maintenance & Improvement and other such operational circumstances as stipulated
in the Agreement.

(a)   The cost of all fuel and lubricating oil consumed from receipt of
      notification of requirement and until return to a mooring or berth at the
      Assigned Port;

(b)   The salaries, wages, allowances, pension fund contributions, travel costs
      (including any necessary transfer or officers and crew between) and
      accommodation costs of such additional officers, crew, or other personnel
      as applicable, necessary to increase the Cableship from a standby basis to
      a fully operational basis;

(c)   The costs of additional goods and services in respect of any particular
      operation over and above the normal operating requirements of the
      Cableship;

(d)   The cost of providing additional facilities as provided in accordance with
      Article 5(d);

(e)   The cost of harbour and port charges, pilotage, tonnage dues, towage, and
      lighters;

(f)   The additional premiums payable under the hull increased value and
      consumable stores insurance policies when the Cableship is at sea,
      including additional premiums for the Cableships entering and staying in a
      war Zone, as defined by insurers and/or any zone which would not
      ordinarily be covered by reason of the provision of the war risks and
      Protection and Indemnity Association Rules and Regulations and premiums
      required for additional insurance in connection with cable shore-end
      operations and other facilities referred to in Article 5(d) of this
      Agreement.

(g)   The costs associated in disengaging a Cableship from Refit early in
      accordance with Article 19(q).

(h)   The costs of fuel used in port while on Standby.

                                      C-2
<PAGE>

                                                                    SCHEDULE C.3

                        Estimated Running Costs for 1999

                                  RAYMOND CROZE

CURRENCY: FRENCH FRANCS

<TABLE>
<CAPTION>
                         ------------------------------------------------------------------
                         IN PORT                      AT SEA REPAIR OPERATIONS
                         DAILY RATE       -------------------------------------------------
                                          ON PASSAGE        ON GROUND/       OTHER COSTS
                                                            CABLE WORK       PER OPERATION
-------------------------------------------------------------------------------------------
<S>                      <C>              <C>               <C>                 <C>
FUEL DETAILS

Fuel
  -Consumed              1,5 Tons         20 Tons           10 Tons
  -Current Price         1,550 FF/T(***)  1,550 FF/T(***)   1,550 FF/T(***)
-------------------------------------------------------------------------------------------

COSTS

i Fuel                        2,325           31,000            15,500

ii Labour costs
  -Additional crew                            24,633            24,633
  -Overtime                                                      7,405
  -Additional                                  7,497             7,497
   victualling

iii At Sea Insurance                           2,805             2,805

iv Port Charges                                                                  14,994(*)

v Cable Handling
  -Loading                                                                       17,442(**)
  -Unloading                                                                     17,442(**)

vi Consumable/                                                                   34,680 s
   Lost Gear

vii Miscellaneous                                                                 6,120
-------------------------------------------------------------------------------------------
TOTAL (FF)                    2,325           65,935            57,840           90,678
-------------------------------------------------------------------------------------------
</TABLE>

(*)    Estimate of La Seyne port charges
(**)   Estimate of foreign depots
(***)  Annual average cost subject to currency rate USD/FF

                                      C-3
<PAGE>

                                                                    SCHEDULE C.3

                        Estimated Running Costs for 1999

                                     TELIRI

CURRENCY: ITALIAN LIRAS

<TABLE>
<CAPTION>
-------------------------------------------------------------------------------------------
                    in port daily rate                at sea repair operations
                       (tons/24h)      ----------------------------------------------------
                                       On passage daily     on ground         other costs
                                            rate            daily rate        per operation
-------------------------------------------------------------------------------------------
<S>                   <C>                <C>               <C>                <C>
FUEL DETAILS
-------------------------------------------------------------------------------------------
i. Fuel Gasoil
-------------------------------------------------------------------------------------------
-Consumed                2,8               20,0               10,0
-------------------------------------------------------------------------------------------
-Current price         382,000            382,000           382,000
-------------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------
COSTS                     ITL               ITL                ITL               ITL
-------------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------
i. Fuel               1,069.600          7,640,000         3,820,000
-------------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------
ii. Labour Costs
-------------------------------------------------------------------------------------------
-Additional Crew                         6.009,000         6.009,000
-------------------------------------------------------------------------------------------
-Overtime                                1,432,000         4,178,000
-------------------------------------------------------------------------------------------
-Additional                              1,561,000         1,561,000
Victualling
-------------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------
iii. At Sea Insurance                     858,000           858,000
-------------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------
iv. Port Charges                                                              4,370,000
-------------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------
v. Cable Handling
-------------------------------------------------------------------------------------------
-Loading                                                                      4,370,000
-------------------------------------------------------------------------------------------
-Unloading                                                                    4,370,000
-------------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------
vi. Consumable/                                                               6,243,000
   Lost Gear
-------------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------
vii. Miscellaneous                                                            9,364,000
-------------------------------------------------------------------------------------------
TOTAL (ITL)           1.069.600         17.500.000        16.426.000         28.717.000
-------------------------------------------------------------------------------------------
</TABLE>

                                      C-4
<PAGE>

                                                                    SCHEDULE C.3

                        Estimated Running Costs for 1999

                                      TENEO

CURRENCY: PESETAS

<TABLE>
<CAPTION>
--------------------------------------------------------------------------------------------
                        in port                      at sea repair operations
                                      ------------------------------------------------------
                                         On passage      on ground/ cable     other costs
                                                              work            per operation
--------------------------------------------------------------------------------------------
<S>                    <C>              <C>                  <C>               <C>
FUEL DETAILS
--------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------
i. Fuel
--------------------------------------------------------------------------------------------
-Consumed                 1,5 T            14,0 T             8,0 T
--------------------------------------------------------------------------------------------
-Current price         26.200 Pts        26.200 Pts         26.200 Pts
--------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------
COSTS                     PTS               PTS                PTS                PTS
--------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------
i. Fuel                39.300            366.800            209.600
--------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------
ii. Labour Costs                         462.294            626.764
--------------------------------------------------------------------------------------------
-Additional Crew                         348.650            598.372
--------------------------------------------------------------------------------------------
-Overtime                                   0               114.747
--------------------------------------------------------------------------------------------
-Additional                              113.644            113.644
Victualling
--------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------
iii. At Sea Insurance                     62.503             62.503
--------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------
iv. Port Charges                                                                397.753
--------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------
v. Cable Handling                                                               340.931
--------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------
vi. Consumable/                                                                 454.574
    Lost Gear
--------------------------------------------------------------------------------------------

--------------------------------------------------------------------------------------------
vii. Miscellaneous                                                             1.136.436
--------------------------------------------------------------------------------------------
     TOTAL             39.300            891.597            1.098.867          2.329.694
--------------------------------------------------------------------------------------------
</TABLE>

                                       C-5
<PAGE>

                                                                    SCHEDULE C.3

                        Estimated Running Costs for 1999

                                    CERTAMEN

<TABLE>
<CAPTION>
-------------------------------------------------------------------------------------------
                    in port daily rate                at sea repair operations
                       (tons/24h)      ----------------------------------------------------
                                       On passage daily     on ground         other costs
                                            rate            daily rate        per operation
-------------------------------------------------------------------------------------------
<S>                   <C>                <C>               <C>                <C>
FUEL DETAILS
-------------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------
i. Fuel Gasoil
-------------------------------------------------------------------------------------------
-Consumed                  2               18.0               12.0
-------------------------------------------------------------------------------------------
-Current price          382,000          382,000            382,000
-------------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------
COSTS                     ITL               ITL                ITL               ITL
-------------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------
i. Fuel                 764.000         6.876.000          4.584.000
-------------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------
ii. Labour Costs
-------------------------------------------------------------------------------------------
-Additional Crew                        6.009,000          5.009,000
-------------------------------------------------------------------------------------------
-Overtime                               1,432,000          4,178,000
-------------------------------------------------------------------------------------------
-Additional                             1,561,000          1,561,000
Victualling
-------------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------
iii. At Sea Insurance                    551.000            551.000
-------------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------
iv. Port Charges                                                              4,370,000
-------------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------
v. Cable Handling
-------------------------------------------------------------------------------------------
-Loading                                                                      4,370,000
-------------------------------------------------------------------------------------------
-Unloading                                                                    4,370,000
-------------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------
vi. Consumable/                                                               6,243,000
   Lost Gear
-------------------------------------------------------------------------------------------

-------------------------------------------------------------------------------------------
vii. Miscellaneous                                                            9,364,000
-------------------------------------------------------------------------------------------
TOTAL (ITL)             764.000         16.429.000        16.883.000         28.717.000
-------------------------------------------------------------------------------------------
</TABLE>

                                      C-6
<PAGE>

                                   SCHEDULE E

--------------------------------------------------------------------------------

                         PRO-FORMA DOCUMENT OF ACCESSION

<PAGE>

                                                                    SCHEDULE E.1

                  SUPPLEMENTARY AGREEMENT FOR THE ADMISSION OF

                                XXXXXXXXXXXXXXXX

                     TO THE MEDITERRANEAN CABLE MAINTENANCE
                                    AGREEMENT

                                     (MECMA)

This Supplementary Agreement is made between the Parties to the Mediterranean
Cable Maintenance Agreement as listed in Appendix A and hereinafter referred to
as "the Parties", and

WHEREAS

(A)   The Parties are parties to an agreement known as the Mediterranean Cable
      Maintenance Agreement (MECMA) dated 1st of January 1999.

(B)   Pursuant to Article 18 of the MECMA, which makes provision for the
      admission of new Parties to the Agreement who have or acquire an interest
      in the Repair, Maintenance & Improvement of submarine cables within the
      geographical boundaries more fully described in the MECMA, being such an
      entity with such an interest by virtue of its being Maintenance Authority
      of submarine cables described in Appendix C attached, which is installed
      within the geographical boundaries of the MECMA, desires to become Party
      of the MECMA.

(C)   The Parties hereby agree to the admission of XXX to the MECMA subject to
      the terms and conditions of this Agreement and authorise the Chairman of
      the MECMA Management Committee to act as a representative of all Parties
      in the execution of such a Supplementary Agreement for the admission of
      new Parties.

                                      E-1
<PAGE>

                                                                    SCHEDULE E.1

NOW IT IS HEREBY AGREED that

The Parties agree to the admission of XXX to the MECMA as a Party to the MECMA.
XXX hereby agrees to abide by all the terms and conditions of the MECMA.

The Parties hereby agree that XXX shall be added as a Party to Schedule A and
the cables described in Appendix C shall be added as Scheduled Cables to
Schedule B and this Supplementary Agreement shall become effective on XXX.

This Supplementary Agreement shall be binding on the Parties and XXX, their
Successors and permitted Assigns.

Except specifically amended by this Supplementary Agreement to the MECMA, the
MECMA shall remain unchanged and in full force and effect.

In WITNESS WHEREOF the Parties hereto have executed this Supplementary Agreement
through their respective duly authorised Representatives.

FOR AND ON BEHALF OF
THE MECMA EXISTING PARTIES

BY THE CHAIRMAN OF THE MECMA
MANAGEMENT COMMITTEE

____________DATE_____________

FOR AND ON BEHALF OF XXX

_____________DATE____________

                                      E-2
<PAGE>

                                                                    SCHEDULE E.1

                                                                      APPENDIX A

                                     PARTIES

IDENTIFICATION OF PARTIES

                                      E-3
<PAGE>

                                                                    SCHEDULE E.1

                                                                      APPENDIX B

                                 NEW PARTY(IES)

                                      E-4
<PAGE>

                                                                    SCHEDULE E.1

                                                                      APPENDIX C

                        SUBMARINE CABLE MAINTAINED BY XXX

                                IN THE MECMA AREA

--------------------------------------------------------------------------------
CABLE  Station 1  Station 2  Type  L  L1  A  k/s     Nr of     Discount   Total
                                                  F.O. pairs                UR
--------------------------------------------------------------------------------

--------------------------------------------------------------------------------

Central Billing Party:

Apportionment of costs:

                                      E-5

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00001-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00001-of-00352.parquet"}]]