.
.
.
DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF SEPTEMBER 7, 2004
<Table>
<Caption>
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR
- --------------------- ---------------- ---------------- ---------------- ---------------- ----------------
DOMESTIC DEEPWATER SEMISUBMERSIBLES(6)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Quest 3,500' Victory Class GOM Contracted Noble Energy
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Star 5,500' Victory Class GOM Contracted Kerr-McGee
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean America 5,500' Ocean Odyssey GOM Contracted Mariner
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Valiant 5,500' Ocean Odyssey GOM Contracted ENI
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Victory 5,500' Victory Class GOM Contracted W&T Offshore
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Confidence 7,500' DP Aker H-3.2 GOM Contracted BP
Modified
- ------------------------------------------------------------------------------------------------------------------------------------
DOMESTIC 2ND/3RD GENERATION SEMISUBMERSIBLES(3)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Concord 2,200' F&G SS-2000 GOM Idle DODI
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Lexington 2,200' F&G SS-2000 GOM Contracted Walter Oil & Gas
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Saratoga 2,200' F&G SS-2000 GOM Contracted LLOG
(Table Continued)
<Table>
<Caption>
FUTURE CONTRACT AND OTHER
RIG NAME CURRENT TERM DAYRATE (000S) START DATE EST. END DATE INFORMATION
- --------------------- ---------------- ---------------- ---------------- ---------------- --------------------------------
DOMESTIC DEEPWATER SEMISUBMERSIBLES(6)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Quest one well plus low 50's early Sept. 2004 late Oct. 2004 LOI for one well plus option in
option mid 70's beginning late Oct. and
ending late Nov. 2004, subject
to Noble Energy option.
Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Star fourth of four low 60's early June 2004 early Oct. 2004 220 day extension with
wells Kerr-McGee in upper 70's
beginning early Oct. 2004 and
ending mid May 2005. Available;
actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean America second of three mid 70's mid June 2004 early Nov. 2004 One well extension plus option
wells plus with Mariner in mid 80's
option beginning early Nov. 2004 and
ending late Jan. 2005.
Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Valiant second of three high 50's late Dec. 2003 mid Oct. 2004 LOI for one well plus options in
wells plus mid 80's beginning mid Oct. and
option ending late Nov. 2004.
Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Victory two wells mid 40's mid Aug. 2004 late Nov. 2004 Rate adjusts to mid 70's in late
Sept. LOI for one well plus
option in mid 90's beginning
late Nov. 2004 and ending late
Jan. 2005. Available; actively
marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Confidence five-year term 170's early Jan. 2001 early Jan. 2006 Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
DOMESTIC 2ND/3RD GENERATION SEMISUBMERSIBLES(3)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Concord -- -- -- -- Approximately 120 days
maintenance beginning early June
and ending early Oct. 2004. LOI
for one well plus options in mid
50's beginning early Oct. and
ending late Nov. 2004. LOI for
one well in mid 50's beginning
late Nov. 2004 and ending late
Jan. 2005. Available; actively
marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Lexington one well plus high 40's late March 2004 mid March 2005 One well extension plus option
option with Walter in high 30's
beginning mid Aug. and ending
early Sept. 2004; followed by
three well extension with Walter
beginning in early Sept. and
ending in mid Dec. 2004. Rate
for first well in mid 40's,
second and third wells in upper
40's. Three additional extension
wells with Walter beginning in
mid Dec. 2004 and ending
mid-March 2005. Rate for first
and second wells in mid 50s with
third well in low 60s.
Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Saratoga one well mid 40s late June 2004 mid Oct. 2004 One additional well plus option
extension plus with LLOG in low 50s beginning
option mid Sept. and ending mid Oct.
2004. Available; actively
marketing.
</Table>
DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF SEPTEMBER 7, 2004
<Table>
<Caption>
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR
- --------------------- ---------------- ---------------- ---------------- ---------------- ----------------
DOMESTIC JACKUPS (12)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Crusader 200' Mat Cantilever GOM Contracted Walter Oil & Gas
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Drake 200' Mat Cantilever GOM Contracted Chevron/Texaco
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Champion 250' Mat Slot GOM Contracted Mariner
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Columbia 250' Independent Leg GOM Contracted Kerr-McGee
Cantilever
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Spartan 300' Independent Leg GOM Contracted LLOG
Cantilever
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Spur 300' Independent Leg GOM Idle DODI
Cantilever
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean King 300' Independent Leg GOM Contracted Houston
Cantilever Exploration
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Nugget 300' Independent Leg GOM Contracted Spinnaker
Cantilever
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Summit 300' Independent Leg GOM Contracted LLOG
Cantilever
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Warwick 300' Independent Leg GOM Contracted Newfield
Cantilever
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Titan 350' Independent Leg GOM Contracted Stone Energy
Cantilever
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Tower 350' Independent Leg GOM Contracted EOG Resources
Cantilever
(Table Continued)
<Table>
<Caption>
FUTURE CONTRACT AND OTHER
RIG NAME CURRENT TERM DAYRATE (000S) START DATE EST. END DATE INFORMATION
- --------------------- ---------------- ---------------- ---------------- ---------------- --------------------------------
DOMESTIC JACKUPS (12)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Crusader one well plus low 30's late July 2004 early Sept. 2004 Two wells plus option with
option Walter in mid 30's beginning
early Sept. and ending early
Nov. 2004. Available; actively
marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Drake two wells plus mid 30s late Aug. 2004 mid Oct. 2004 Available; actively marketing.
option
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Champion one well mid 20's mid Aug. 2004 early Sept. 2004 Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Columbia one well mid 30's early Aug. 2004 early Sept. 2004 Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Spartan two wells plus mid 30's mid July 2004 early Sept. 2004 Two well extension plus option
option with LLOG in upper 30's
beginning early Sept. and ending
early Dec. 2004. Available;
actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Spur -- -- -- -- Two wells with Mariner in upper
30s beginning early Sept. and
ending late Oct. 2004.
Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean King two wells mid 40s late Aug. 2004 late Nov. 2004 Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Nugget one well plus mid 30's early Aug. 2004 late Sept. 2004 Available; actively marketing.
option
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Summit one well plus mid 30's early Aug. 2004 early Sept. 2004 Three well extension plus option
option with LLOG in upper 30s beginning
early Sept. and ending mid Dec.
2004. Available; actively
marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Warwick one well plus low 40's early Aug. 2004 late Sept. 2004 Available; actively marketing.
option
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Titan second of two mid 40's mid July 2004 early Oct. 2004 Available; actively marketing.
wells plus
option
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Tower second of two high 30's mid July 2004 early Oct. 2004 Available; actively marketing.
wells
</Table>
DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF SEPTEMBER 7, 2004
<Table>
<Caption>
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR
- --------------------- ---------------- ---------------- ---------------- ---------------- ----------------
INTERNATIONAL SEMISUBMERSIBLES(17)
- ------------------------------------------------------------------------------------------------------------------------------------
MEXICO
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Ambassador 1,100' Bethlehem SS- GOM Contracted PEMEX
2000
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Whittington 1,500' Aker H-3 GOM Contracted PEMEX
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Worker 3,500' F&G 9500 GOM Contracted PEMEX
Enhanced
Pacesetter
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Yorktown 2,850' F&G SS-2000 GOM Contracted PEMEX
- ------------------------------------------------------------------------------------------------------------------------------------
AFRICA
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Nomad 1,200' Aker H-3 Gabon Contracted Vaalco/SASOL
- ------------------------------------------------------------------------------------------------------------------------------------
NORTH SEA
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Guardian 1,500' Earl & Wright North Sea Contracted Shell
Sedco 711 Series
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Princess 1,500' Aker H-3 North Sea Contracted Talisman
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Vanguard 1,500' Bingo 3000 North Sea Contracted Talisman
- ------------------------------------------------------------------------------------------------------------------------------------
AUSTRALASIA
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Bounty 1,500' Victory Class New Zealand Contracted NZOP
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Patriot 1,500' Bingo 3000 New Zealand Contracted Tap Oil
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Epoch 1,640' Korkut Australia Contracted Santos
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean General 1,640' Korkut Vietnam Contracted PVE&P
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Baroness 7,000' Victory Class Indonesia Contracted Unocal
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Rover 7,000' Victory Class Malaysia Contracted Murphy
(Table Continued)
<Table>
<Caption>
FUTURE CONTRACT AND OTHER
RIG NAME CURRENT TERM DAYRATE (000S) START DATE EST. END DATE INFORMATION
- --------------------- ---------------- ---------------- ---------------- ---------------- --------------------------------
INTERNATIONAL SEMISUBMERSIBLES(17)
- ------------------------------------------------------------------------------------------------------------------------------------
MEXICO
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Ambassador four year term mid 50's late July 2003 mid Dec. 2007 Available.
work
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Whittington four year term low 60's late July 2003 early Oct. 2006 Available.
work
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Worker four year term high 60's mid Aug. 2003 late July 2007 Available.
work
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Yorktown four year term mid 40's late Oct. 2003 mid July 2007 Available.
work
- ------------------------------------------------------------------------------------------------------------------------------------
AFRICA
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Nomad three wells plus high 40's early May 2004 late Sept. 2004 Available; actively marketing.
option
- ------------------------------------------------------------------------------------------------------------------------------------
NORTH SEA
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Guardian one year high 40's late March 2004 late March 2005 Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Princess three wells plus low 50's early Aug. 2004 mid Oct. 2004 LOI for extension in low 60's
option beginning mid Oct. and ending
late Dec. 2004, followed by one
year extension in low 80's
beginning early Jan. 2005 and
ending late Dec. 2005.
Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Vanguard one well low 60's late June 2004 early Oct. 2004 One well in Norway with ENI in
low 140's beginning early Oct.
2004 and ending early Jan. 2005.
Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
AUSTRALASIA
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Bounty one option low 70's mid July 2004 early Sept. 2004 Three wells with OMV in mid 70's
declared plus beginning in early Sept. and
demobe ending in late Dec. 2004.
Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Patriot one well high 70's early Sept. 2004 mid Sept. 2004 Mobe to Australia beginning mid
Sept. and ending late Sept.
2004. First of two wells with
Bass Straits O&G beginning late
Sept. and ending early Oct. Two
wells with Santos beginning
early Oct. and ending late Oct.
LOI for two wells (unnamed
operator) plus option beginning
late Oct. and ending mid Dec.
Second of two wells with Bass
Straits beginning mid Dec. 2004
and ending mid Jan. 2005. LOI
for two wells (unnamed operator)
beginning mid Jan. and ending
mid Feb. Two wells plus option
with Santos beginning mid Feb.
and ending late April. LOI for
four wells (unnamed operator)
beginning late April and ending
late July 2005. All wells in
upper 70's. Available; actively
marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Epoch Exeter/Mutineer mid 60's mid Jan. 2004 mid March 2005 Available; actively marketing.
development plus
option
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean General five completion mid 50's mid June 2004 late Oct. 2004 One well plus option and demobe
options with KNOC in mid 50's beginning
late Oct. and ending late Dec.
2004. Available; actively
marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Baroness 180 day option 110's late April 2004 early Nov. 2004 Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Rover second of two high 110's late July 2004 early Sept. 2004 First option well declared by
firm wells plus Murphy beginning early Sept. in
options lower 120's, and ending early
Oct. Available; actively
marketing.
</Table>
DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF SEPTEMBER 7, 2004
<Table>
<Caption>
RIG NAME WD DESIGN LOCATION STATUS* OPERATOR
- --------------------- ---------------- ---------------- ---------------- ---------------- ----------------
BRAZIL
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Yatzy 3,300' DP DYVI Super Brazil Contracted Petrobras
Yatzy
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Winner 3,500' Aker H-3 Brazil Contracted Petrobras
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Alliance 5,000' Alliance Class Brazil Contracted Petrobras
- ------------------------------------------------------------------------------------------------------------------------------------
INTERNATIONAL DRILLSHIPS(1)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Clipper 7,500' DP Brazil Contracted Petrobras
Fluor/Mitsubishi
- ------------------------------------------------------------------------------------------------------------------------------------
INTERNATIONAL JACKUPS(2)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Sovereign 250' Independent Leg Indonesia Contracted Amerada Hess
Cantilever
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Heritage 300' Independent Leg -- Dry tow to India DODI
Cantilever
- ------------------------------------------------------------------------------------------------------------------------------------
COLD STACKED(4)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Liberator 600' Aker H-3 S. Africa Cold Stacked DODI
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Endeavor 2,000' Victory Class GOM Cold Stacked DODI
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Voyager 3,200' Victory Class GOM Cold Stacked DODI
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean New Era 1,500' Korkut GOM Cold Stacked DODI
(Table Continued)
<Table>
<Caption>
FUTURE CONTRACT AND OTHER
RIG NAME CURRENT TERM DAYRATE (000S) START DATE EST. END DATE INFORMATION
- --------------------- ---------------- ---------------- ---------------- ---------------- --------------------------------
BRAZIL
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Yatzy 700 day mid 70's early Nov. 2003 mid Oct. 2005 Available.
extension
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Winner 700 day mid 50's early April 2004 mid March 2006 Available.
extension
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Alliance four-year 110's early Sept. 2000 late Sept. 2004 Testing. Available.
contract
- ------------------------------------------------------------------------------------------------------------------------------------
INTERNATIONAL DRILLSHIPS(1)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Clipper 700 day low 100's early Jan. 2003 early March 2006 Available; actively marketing.
extension
- ------------------------------------------------------------------------------------------------------------------------------------
INTERNATIONAL JACKUPS(2)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Sovereign option well high 30's early April 2004 mid Sept. 2004 Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Heritage -- -- -- -- Lump sum mobe to India beginning
early Sept. and ending mid Oct.
Six wells plus options with
Cairn Energy in lower 60's
beginning mid Oct. 2004 and
ending early May 2005.
Available; actively marketing.
- ------------------------------------------------------------------------------------------------------------------------------------
COLD STACKED(4)
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Liberator -- -- -- -- Cold stacked Nov. '02.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Endeavor -- -- -- -- Cold stacked March '02.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean Voyager -- -- -- -- Cold stacked March '02.
- ------------------------------------------------------------------------------------------------------------------------------------
Ocean New Era -- -- -- -- Cold stacked Dec. '02.
</Table>
NOTES:
* GENERALLY, RIG UTILIZATION RATES APPROACH 95-98% DURING CONTRACTED PERIODS;
HOWEVER, UTILIZATION RATES CAN BE ADVERSELY IMPACTED BY ADDITIONAL DOWNTIME DUE
TO UNSCHEDULED REPAIRS AND MAINTENANCE, WEATHER CONDITIONS AND OTHER FACTORS.
GOM = Gulf of Mexico