Diamond Offshore Drilling (DODRW) 8-K RECENT COMMITMENTS — (See Body of Report For Contract Details/Date Changes and Other Information) No new fixtures

Exhibit 99.1

DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF
September 22, 2008

RECENT COMMITMENTS — (See Body of Report For Contract Details/Date Changes and Other Information)
No new fixtures

Rig Name	WD	Location	Status	Operator	Current Term	Dayrate ($000s)		Start Date	Est. End Date
Domestic Deepwater Semisubmersibles (8)
Ocean Quest	3,500’	GOM	Current Contract	Noble	two-year term + unpricedoption	upper 350’s		mid June 2007	mid June 2009
		GOM/Brazil	Prep, mobe & acceptance test for OGX	OGX			0	mid June 2009	early Oct. 2009
		Brazil	Future Contract	OGX	two-year term + unpricedoption	low 420’s		early Oct. 2009	early Oct. 2011
Ocean Star	5,500’	GOM	Current Contract	Anadarko	term extension	upper 410’s		late Nov. 2007	late Nov. 2008
		GOM	Future Contract	LOI	Part 1 — 18 month-term	mid 460’s		late Nov. 2008	late May 2009
		GOM	Future Contract	LOI	Remainder term.	low 520’s		late May 2009	late May 2010
Ocean America	5,500’	GOM	Current Contract	Mariner	Part 1 — 18-month term	low 470’s		mid March 2008	late Oct. 2008
		GOM	Future Contract	LOI	Remainder term.	low 520’s		late Oct. 2008	early Jan. 2009 interrupt term
		GOM	Special Survey & Maintenance	DODI			0	early Jan. 2009	late March 2009
		GOM	Future Contract	LOI	Cont. remainder term	low 520’s		late March 2009	mid July 2010
Ocean Valiant	5,500’	GOM	Special Survey & Maintenance	DODI			0	early Aug. 2008	late Nov. 2008 resume contract
		GOM	Current Contract	Anadarko	resume one-year term extension	upper 420’s		late Nov. 2008	early July 2009
Ocean Victory	5,500’	GOM	Current Contract	Callon	two wells	low 500’s		mid Aug. 2008	early March2009
		GOM	Future Contract (swap from old Voyagercontract in low 300’s)	Newfield	one well	low 300’s		early March2009	early May2009
		GOM	Future Contract	Newfield	one well extension	low 500’s		early May2009	midJune 2009
		GOM	Future Contract	ATP	one-year term, minimum	low 540’s		midJune 2009	midJune 2010
Ocean Baroness	7,000’	GOM	Current Contract	Hess	term extension + unpricedoption	mid 360’s		late Nov. 2007	mid April 2010
Ocean Confidence	10,000’	GOM	Current Contract	Murphy	four-year term + unpricedoption	low 500’s		late Feb. 2008	late March 2012
		GOM	Contract to be interrupted for thruster maintenance	DODI			0	early Oct. 2008	mid Oct. 2008 resume contract
Ocean Endeavor	10000’	GOM	Current Contract	Devon	four-year term + unpriced option	mid 260’s		early July 2007	late June 2011

DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF
September 22, 2008

						Dayrate			Est. End
Rig Name	WD	Location	Status	Operator	Current Term	($000s)		Start Date	Date
Domestic 2nd and 3rd Generation Semisubmersibles (2)
Ocean Ambassador	1,100’	GOM	Special Survey & Maintenance	DODI			0	early Aug. 2008	late Oct. 2008
		GOM	Future Contract	Taylor	seven-month term	mid 280’s		late Oct. 2008	early June 2009
		GOM/Brazil	Prep, mobe & acceptance test for OGX	OGX			0	early June 2009	mid Sept. 2009
		Brazil	Future Contract	OGX	three-year term + unpriced option	low 260’s		mid Sept. 2009	mid Sept. 2012
Ocean Saratoga	2,200’	GOM	Current Contract	Walter	one well	mid 280’s		late July 2008	early Oct. 2008
		GOM	Future Contract	Walter	four wells	mid 280’s		lateOct. 2008	lateFeb. 2009
Domestic Jack-ups (7)
Ocean Crusader	200’ MC	GOM	Current Contract	Apache	one well	mid 60’s		early Sept. 2008	early Oct. 2008
Ocean Drake	200’ MC	GOM	Special Survey & Maintenance	DODI			0	early Aug. 2008	early Oct. 2008
		GOM	Future Contract	Tarpon	one well	mid 60’s		early Oct. 2008	mid Nov. 2008
		GOM	Future Contract	Tarpon	two wells	mid 70’s		mid Nov. 2008	mid Jan. 2009
Ocean Champion	250’ MS	GOM	Current Contract	Stone	Assignment from Bois d’Arc	mid 60’s		early Sept. 2008	early Oct. 2008
Ocean Spartan	300’ IC	GOM	Current Contract	Samson	four wells	mid 80’s		mid June 2008	early Oct. 2008
		GOM	Future Contract	Samson	two-well extension	low 100’s		early Oct. 2008	lateDec. 2008
Ocean Summit	300’ IC	GOM	Current Contract	Energy Partners	one well extension + unpricedoption	mid 80’s		late May 2008	mid Sept. 2008
		GOM	Future Contract	Energy Partners	five-wells + unpricedoption	low 100’s		mid Sept. 2008	midNov. 2008
Ocean Titan	350’ IC	GOM	Current Contract	Apache	second of three wells	high 100’s		lateSept. 2008	lateOct. 2008
		GOM	Future Contract	Apache	third of three wells	low 110’s		lateOct. 2008	early Dec. 2008
		GOM	Future Contract	Apache	four-month extension + unpricedoption	low 130’s		early Dec. 2008	early April2009
Ocean Tower	350’ IC	GOM	Current Contract	Chevron	Rig damaged by Hurricane Ike, contract under review with customer			to be determined	to be determined

DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF
September 22, 2008

						Dayrate			Est. End
Rig Name	WD	Location	Status	Operator	Current Term	($000s)		Start Date	Date
International Semisubmersibles (19)
MEXICO
Ocean New Era	1,500’	GOM	Current Contract	PEMEX	2 1/2 year term	mid 260’s		late Oct. 2007	mid Feb. 2010
Ocean Voyager	3,000’	GOM	Current Contract	PEMEX	2 1/2 year term	mid 330’s		early Nov. 2007	late Feb. 2010
NORTH SEA/MEDITERRANEAN
Ocean Nomad	1,200’	North Sea	Contract interrupted for Special Survey & Maintenance	DODI			0	mid Sept. 2008	mid Nov. 2008 resume contract
		North Sea	Current Contract	Talisman	resume two-year term extension	mid 330’s		midNov. 2008	late Sept. 2010
Ocean Guardian	1,500’	North Sea	Current Contract	Oilexco	remainder two-year term	low 350’s		early Sept. 2008	mid July 2009
		North Sea	Future Contract	Oilexco	two-year term extension	mid 380’s		midJuly. 2009	earlySept. 2011
Ocean Princess	1,500’	North Sea	Current Contract	Talisman	two-year term extension	upper 330’s		mid Feb. 2008	late Oct. 2008
		North Sea	Contract to be interrupted for Special Survey & Maintenance	DODI			0	late Oct. 2008	late Dec. 2008 resume contract
		North Sea	Current Contract	Talisman	resume two-year term extension	upper 330’s		late Dec. 2008	mid April 2010
Ocean Vanguard	1,500’	North Sea	Current Contract	Statoil	two-year term extension + unpricedoption	low 400’s		late April 2008	mid April 2010
Ocean Lexington	2,200’	Egypt	Current Contract	BP	36-month term	mid 260’s		late Nov. 2006	mid Aug. 2009
		Egypt/Brazil	Prep, mobe & acceptance test for OGX	OGX			0	mid Aug. 2009	late Jan. 2010
		Brazil	Future Contract	OGX	three-year term + unpricedoption	mid 330’s		late Jan. 2010	late Jan. 2013

DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF
September 22, 2008

						Dayrate			Est. End
Rig Name	WD	Location	Status	Operator	Current Term	($000s)		Start Date	Date
AUSTRALASIA
Ocean Bounty	1,500’	Australia	Current Contract	Woodside	continue one-year term	low 350’s		early Sept. 2008	late March 2009
		Australia	Re-engine and upgrade	DODI			0	late March 2009	to be determined followed by two-year term
		Australia	Future Contract	Woodside	two-year term + unpricedoption	mid 420’s		to be determined	to be determined
Ocean Patriot	1,500’	Australia	Current Contract	Santos	one-year term + unpricedoption	upper 370’s		mid May 2008	late Dec. 2008
		Australia	Future Contract	Apache	two-year term + unpricedoption	between 380-420		late Dec. 2008	late Dec. 2010
Ocean Epoch	1,640’	Australia	Current Contract	Apache	one-year term	mid 350’s		early March 2008	early March 2009
		Australia	Future Contract	BHPB	550-day term + unpricedoptions	low 350’s		early March 2009	early Sept. 2010
Ocean General	2,400’	Malaysia	Special Survey & Maintenance	DODI			0	late July 2008	late Sept. 2008
		Vietnam	Future Contract	PVEP	Approx. two-year term + unpricedoptions	low 280’s		late Sept. 2008	late Sept. 2010
Ocean Rover	7,000’	Malaysia	Intermediate Survey & Maintenance	DODI			0	late July 2008	late Sept. 2008 resume contract
		Malaysia	Current Contract	Resume Murphy contract	balance previously declared option wells	high 240’s		lateSept. 2008	early Jan. 2009
		Malaysia	Future Contract	Newfield	one well	mid 450’s		early Jan. 2009	mid Feb. 2009
		Malaysia	Future Contract	Murphy	two-year term extension	mid 450’s		mid Feb. 2009	mid Feb. 2011

DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF
September 22, 2008

						Dayrate			Est. End
Rig Name	WD	Location	Status	Operator	Current Term	($000s)		Start Date	Date
BRAZIL
Ocean Whittington	1,500’	Brazil	Current Contract	Petrobras	five-year term plus potential 15% bonus	mid 220’s		late Aug. 2007	late Aug. 2012
		Brazil	Contract to be interrupted to resume and complete contract upgrade work	DODI			0	mid Oct. 2008	late Nov. 2008 resume contract
		Brazil	Current Contract	Petrobras	resume five-year term plus potential 15% bonus	mid 220’s		late Nov. 2008	late Aug. 2012
Ocean Concord	2,200’	Brazil	Current Contract	Petrobras	five-year term plus potential 15% bonus	low 230’s		mid Jan. 2008	mid Jan. 2013
Ocean Yorktown	2,850’	Brazil	Current Contract	Petrobras	five-year term plus potential 15% bonus	mid 230’s		mid Aug. 2008	mid Sept. 2013
Ocean Yatzy	3,300’	Brazil	Current Contract	Petrobras	five-year term extension plus potential 17% bonus	mid 110’s		early Oct. 2005	early Oct. 2009
		Brazil	Future Contract	Petrobras	five-year term plus potential 10% bonus	mid 240’s		early Oct. 2009	early Oct. 2014
Ocean Winner	3,500’	Brazil	Current Contract	Petrobras	four-year term extension plus potential 5% bonus	low 110’s		mid March 2006	mid March 2010
		Brazil	Future Contract	Petrobras	five-year term extension plus potential 10% bonus	low 270’s		mid March 2010	mid March 2015
Ocean Worker	3,500’	Brazil	Current	DODI	prep., plus acceptance testing		0	late July 2008	early Dec. 2008
		Brazil	Future Contract	Petrobras	six-year term plus potential 10% bonus	low 270’s		early Dec. 2008	early Dec. 2014
Ocean Alliance	5,000’	Brazil	Current Contract	Petrobras	one-well extension retroactive to late March 2008	mid 520’s		late March 2008	early Oct. 2008 resume contract
		Brazil	Resume Contract	Petrobras	resume four-year extension plus 20% potential bonus	mid 150’s		early Oct. 2008	late Nov. 2009
		Brazil	Future Contract	Petrobras	six-year term extension plus potential 15% bonus	low 340’s		late Nov. 2009	late Nov. 2015
International Drillship (1)
Ocean Clipper	7,000’	Brazil	Current Contract	Petrobras	five-year extension plus potential 5% bonus	low 180’s		mid Dec. 2005	mid Dec. 2010

DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF
September 22, 2008

						Dayrate			Est. End
Rig Name	WD	Location	Status	Operator	Current Term	($000s)		Start Date	Date
International Jack-ups (8)
Ocean Columbia	250’ IC	Mexico	Current Contract	Pemex	1 1/2-year term	mid 120’s		late Jan. 2008	mid June 2009
Ocean Nugget	300’ IC	Mexico	Current Contract	Pemex	term contract	upper 160’s		early Oct. 2006	late March 2009
Ocean King	300’ IC	Croatia	Current Contract	CROSCO	two-year bareboat charter	upper 100’s		mid Nov. 2007	early Nov. 2009
Ocean Sovereign	300’ IC	Indonesia	Current Contract	Kodeco	extension up to survey	upper 130’s		early Aug. 2008	mid Nov. 2008
		Indonesia	Intermediate Survey	DODI			0	mid Nov. 2008	late Dec. 2008
		Indonesia	Future Contract	Kodeco	15-month extension + unpricedoption	mid 140’s		late Dec. 2008	late March 2010
Ocean Heritage	300’ IC	Gulf of Suez	Current Contract	IPR	seven-month term	mid 110’s		mid July 2008	mid Feb. 2009
Ocean Spur	300’ IC	Egypt	Current Contract	WEPCO	well work on platform	low 140’s		mid Aug. 2008	late Nov. 2008
		Egypt	Future Contract	WEPCO	one-year term	low 140’s		late Nov. 2008	late Nov. 2009
Ocean Shield	350’ IC	Malaysia	Current Contract	Newfield	six-month term	mid 170’s		late May 2008	late Oct. 2008
		Malaysia	Future Contract	ENI	mobe to Australia followed by 12 month term		0	late Oct. 2008	mid Nov. 2008
		Australia	Future Contract	ENI	12 month term	mid 260’s		mid Nov. 2008	late Oct. 2009
Ocean Scepter	350’ IC	Argentina	Current	DODI	prep for contract		0	early Sept. 2008	late Sept. 2008
		Argentina	Future Contract	Enap Sipetrol/YPF	300-day term contract + unpricedoption	high 190’s		late Sept. 2008	late July 2009

DIAMOND OFFSHORE DRILLING, INC. RIG STATUS REPORT AS OF
September 22, 2008

							Dayrate			Est. End
Rig Name	WD		Location	Status	Operator	Current Term	($000s)		Start Date	Date
Upgrade (1)
Ocean Monarch		10,000	Singapore Shipyard	Current	DODI	upgrade to 5th generation rig		0		late Sept. 2008
			Singapore	Future	DODI	commissioning		0	late Sept. 2008	mid Dec. 2008
			mobe GOM	Future	DODI	mobe to GOM and prep for contract		0	mid Dec. 2008	mid March 2009
			GOM	Future Contract	Anadarko	four-year term + unpricedoption	high 420’s		mid March 2009	mid March 2013

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. An LOI is subject to customary conditions, including the execution of a definitive agreement and as such may not result in a binding contract. Options are un-priced and any extension of contract is subject to mutually agreeable terms & conditions unless otherwise indicated. Indexed contracts generally reprice every 30 days. Mobe revenues (if any) and mobe expenses are deferred, and generally are amortized over the life of the contract. GOM = Gulf of Mexico.

Cost/Revenue Footnote: Contract Drilling Expenses applies to contract drilling expenses ONLY anddoes not include Reimbursable Expenses

On rig utilization, assume 95% for DP units, 96% for conventionally moored rigs, and 98% for jack-ups.

Forward-Looking Statements: The rig status report may contain “forward-looking statements” within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Forward-looking statements include, without limitation, any statement that may project, indicate or imply future results, events, performance or achievements, and may contain or be identified by the words “expect,” “intend,” “plan,” “predict,” “anticipate,” “estimate,” “believe,” “should,” “could,” “may,” “might,” “will,” “will be,” “will continue,” “will likely result,” “project,” “budget,” “forecast,” and similar expressions. Statements by the Company in the rig status report that contain forward-looking statements include, but are not limited to, statements regarding the current term, future dayrates, start and end dates and comments concerning future contracts and availability, letters of intent, utilization, surveys, downtime and other aspects of the Company’s drilling rigs, as well as statements concerning rigs being upgraded or to be upgraded and rigs under construction. Such statements are inherently subject to a variety of assumptions, risks and uncertainties that could cause actual results to differ materially from those anticipated or projected. A discussion of the risk factors that could impact these areas and the Company’s overall business and financial performance can be found in the Company’s reports and other documents filed with the Securities and Exchange Commission. These factors include, among others, general economic and business conditions, operating risks, casualty losses, industry fleet capacity, changes in foreign and domestic oil and gas exploration and production activity, competition, changes in foreign, political, social and economic conditions, regulatory initiatives and compliance with governmental regulations, customer preferences and various other matters, many of which are beyond the Company’s control. Given these concerns, investors and analysts should not place undue reliance on forward-looking statements. Each forward-looking statement speaks only as of the date of the rig status report, and the Company undertakes no obligation to publicly update or revise any forward-looking statement.