Diamond Offshore Drilling, Inc. (NYSE:DO) announced today that it will issue a press release and host a conference call and web cast related to its second-quarter 2009 operating results on Thursday, July 23, 2009. The conference call and web cast will include a discussion by management regarding the Company’s results of operation, as well as an operating overview. The call will begin at 9:00 a.m. CDT.

The number to participate in this conference call is 800-247-9979. Those individuals calling from international locations may participate by dialing 973-321-1100. The conference call host is Les Van Dyke and the Conference ID number is 17957820.

We suggest that you dial in approximately 10 minutes prior to the start of the call. A digital replay of the conference call will be available until September 30, 2009 following the original call, after which it will be archived on the Company’s web site at www.diamondoffshore.com. The phone number for the digital replay is 800-642-1687, or internationally, 706-645-9291. The Conference Call ID number to access the replay is 17957820.

In addition, Diamond Offshore will provide an online, real-time simulcast and rebroadcast of its second-quarter 2009 operating results conference call. The live broadcast of our conference call will be available online at www.diamondoffshore.com on July 23, 2009 beginning at 9:00 a.m. CDT. The online replay will follow immediately after the call and continue until September 30, 2009. Please go to the web site at least 15 minutes before the broadcast to register, download and install any necessary audio software.

Diamond Offshore provides contract drilling services to the energy industry around the globe and is a leader in deepwater drilling. Additional information on Diamond Offshore Drilling, Inc. and access to the Company’s SEC filings is available on the Internet at www.diamondoffshore.com.

Diamond Offshore Drilling, Inc.
Director, Investor Relations
Les Van Dyke, 281-492-5370