Exhibit 10.1.3

                                 AMENDMENT NO. 1
                                     TO THE
                              ATWOOD OCEANICS, INC.
                             1990 STOCK OPTION PLAN



     Pursuant to the terms and provisions of Section 1.8 of the Atwood Oceanics,
Inc.  1990 Stock  Option  Plan (the  "Plan"),  Atwood  Oceanics,  Inc.,  a Texas
corporation (the "Company"),  hereby adopts the following Amendment No. 1 to the
Plan (the "Amendment No. 1"):

                                       1.

     The fourth  sentence of Section  1.12 of the Plan is hereby  amended in its
entirety by substituting the following therefor:

     "In addition to the  foregoing  procedure  which may be  available  for the
exercise of any Stock Option or ISO Option, the option holder may deliver to the
Company a notice of exercise including an irrevocable instruction to the Company
to deliver the stock certificate representing the shares subject to an Option to
a broker authorized to trade in the common stock of the Company."

                                       2.

     The  eighth  and ninth  sentences  of  Section  1.12 of the Plan are hereby
amended in their entirety by substituting the
following therefor:

     "Further,  the broker may also  facilitate a loan to the option holder upon
receipt of the  exercise  notice in advance  receipt for  issuance of the actual
stock  certificate as an  alternative  means of financing and  facilitating  the
exercise of an Option.  For all purposes of effecting the exercise of an Option,
the date on which the option  holder gives the notice of exercise to the Company
will be the date he becomes bound  contractually  to take and pay for the shares
of Stock underlying the Option."

                                       3.

     Section 1.16 of the Plan is hereby amended in its entirety by  substituting
the following therefor:

     "1.16  Non-Transferability  of  Options.  Except as  otherwise  provided in
Section  2.1(b) with respect to Stock  Options,  any Option granted shall not be
transferable otherwise than by will or the laws of descent and distribution, and
the Option may be  exercised,  during the lifetime of the  Participant,  only by
him. More particularly,  (but without limiting the generality of the foregoing),
except as provided in Section  2.1(b) with  respect to Stock  Options and in the
preceding  sentence,  the Option may not be assigned,  transferred,  pledged, or
hypothecated  in any way,  shall not be assignable by operation of law and shall
not be subject  to  execution,  attachment  or similar  process.  Any  attempted
assignment,  transfer, pledge,  hypothecation or other disposition of the Option
contrary to the provisions hereof shall be null and void and without effect. 4.

     Section 1.17 of the Plan is hereby amended in its entirety by  substituting
the following therefor:

     "1.17  Additional  Documents on Death of  Participant  or on  Transfer.  No
transfer  of an  Option  by will or the  laws of  descent  and  distribution  or
otherwise  pursuant to Section  2.1(b)  shall be  effective  to bind the Company
unless the Company shall have been  furnished with written notice and such other
evidence as the  Committee  may deem  necessary to establish the validity of the
transfer  and the  acceptance  of the  successor  to the Option of the terms and
conditions of such Option."

                                       5.

     Section 1.19 of the Plan is hereby amended in its entirety by  substituting
the following therefor:

     "1.19  Shareholder  Rights.  No  option  holder  shall  have a  right  as a
shareholder  with  respect to any shares of Stock  subject to an Option prior to
the purchase of such shares of Stock by exercise of the Option."

                                       6.

     The first  sentence  of Section  1.20 of the Plan is hereby  amended in its
entirety by substituting the following therefor:

     "If dissolution or liquidation of the Company or any merger,  consolidation
or combination in which the Company is not the surviving corporation occurs, the
option  holder  shall  have the  right  immediately  prior to such  dissolution,
liquidation,  merger, consolidation or combination, as the case may be, in whole
or in part, his then remaining Options whether or not then exercisable."

                                       7.

     Section 1.21 of the Plan is hereby amended in its entirety by  substituting
the following therefore:

     "1.21 Payment of Withholding  Taxes.  Upon the exercise of any Stock Option
as provided herein, no such exercise shall be permitted,  nor shall any stock be
issued,  until the Company receives full payment for the Stock purchased,  which
shall include any required federal withholding taxes. Further, upon the exercise
of any Stock Option,  the number of shares of Stock (based on fair market value)
that would be necessary to satisfy the  requirements for withholding any amounts
of taxes due upon  exercise may be retained from the total shares of Stock to be
issued upon exercise.

                                       8.

     Section 2.1 of the Plan is hereby  amended in its entirety by  substituting
the following therefor:

     "Section 2.1 Terms of Stock Options.  Stock Options shall be granted by the
Committee on the following terms and conditions:

     (a) General.  Except as specifically  provided in Section 2.3 hereof,  with
regard to the  death of a  Participant,  no Stock  Option  shall be  exercisable
within  six (6) months  from nor more then ten (10) years  after the date of the
grant.  Subject to such  limitation,  the Committee shall have the discretion to
fix the  period  (the  "Option  Period")  during  which any Stock  Option may be
exercised.  Stock Options  granted to a Participant  shall be  exercisable  only
during the  Participant's  active  employment with the Company,  its parent or a
subsidiary, except that (i) any such Stock Option which is otherwise exercisable
as of the date of death of  Participant  may be  exercised  within  twelve  (12)
months after the death of such Participant, and (ii) any Stock Option granted to
a Participant  which is otherwise  exercisable  as of the date of termination of
such Participant's employment with the Company, its parent or a subsidiary,  may
be exercised at any time within three (3) months of such date of termination. If
a Participant should die during the applicable  three-month period following the
date of such  Participant's  termination,  the period of  exercisability  of any
Stock  Options  granted  to such  deceased  Participant  shall  be  governed  in
accordance with clause (i) of the immediately preceding sentence.

     (b) Limited  Transferability  of Stock  Options.  The Committee may, in its
discretion,  authorize  all or a portion  of any Stock  Options to be granted on
terms which permit  transfer by the  Participant to (i) the spouse,  children or
grandchildren  of the  Participant,  (ii) a trust or  trusts  for the  exclusive
benefit of the spouse, children or grandchildren of the Participant,  or (iii) a
partnership in which the spouse,  children or  grandchildren  of the Participant
are the only partners; provided in each case that (x) the stock option agreement
pursuant  to which  such Stock  Options  are  granted  must be  approved  by the
Committee, and must expressly provide for transferability in a manner consistent
with this section,  and (y) subsequent transfers of transferred options shall be
prohibited  except those made in  accordance  with this section or by will or by
the laws of descent and distribution. Following transfer, any such Stock Options
shall continue to be subject to the same terms and conditions as were applicable
immediately  prior to transfer.  The  provisions  with respect to termination of
employment  set forth above in subsection (a) of this Section 2.1 and in Section
2.3 below shall continue to apply with respect to the original  Participant,  in
which event the Stock Options shall be exercisable by the transferee only to the
extent and for the periods  specified  herein.  The  original  participant  will
remain  subject to  withholding  taxes upon exercise of any such Stock Option by
the  transferee.  The Company  shall have no  obligation  whatsoever  to provide
notice to any  transferee of any matter,  including  without  limitation,  early
termination  of a Stock Option on account of  termination  of  employment or the
original Participant."

                                       9.

     Section 2.3 of the Plan is hereby  amended in its entirety by  substituting
the following therefor:

     "2.3 Acceleration of Otherwise  Unexercisable  Stock Options on Termination
of  Employment  or  Death.  If a  Participant  should  die or  should  terminate
employment with the Company, its parent or a subsidiary,  the Committee,  in its
sole  discretion,  may permit  all or any part of the shares  subject to a Stock
Option  previously  granted to such Participant to be exercised within three (3)
months of the date of  termination of employment of the  Participant,  or twelve
(12)  months  of  the  date  of  death  of  the   Participant,   as  applicable,
notwithstanding  that all  installments,  if any,  with  respect  to such  Stock
Option, had not accrued on such date. Provided,  such discretionary authority of
the Committee may not be exercised  with respect to any Stock Option (or portion
thereof)  if the  applicable  six-month  waiting  period  for  exercise  had not
expired,  except in the event of the death of the  Participant,  when such Stock
Option may, with the consent of the Committee, be exercised  notwithstanding the
fact that the applicable six-month waiting period had not yet expired."

                                       10.

     Section 2.5 of the Plan is hereby  amended in its entirety by  substituting
the following therefor:

     "2.5 Notice to Exercise Stock Options.  Upon exercise of a Stock Option, an
option  holder shall give  written  notice to the  Secretary of the Company,  or
other officer  designated  by the  Committee,  at the  Company's  main office in
Houston, Texas."

                                       11.

     Each  amendment  made by this Amendment No. 1 to the Plan has been effected
in conformity with the provisions of the Plan.

                                       12.

     This  Amendment  No. 1 was adopted by the Board of Directors of the Company
on September 2, 1999.  Approval of this Amendment No. 1 by the  shareholders  of
the Company is not required  pursuant to the terms and provisions of the Plan or
by applicable law.

         Dated:  September 2,1999.



                              ATWOOD OCEANICS, INC.



                              /s/ James M. Holland
                                James M. Holland
                              Senior Vice President