PRESS RELEASE: Transocean Ltd. to Present at Howard Weil Energy Conference

Transocean Ltd. / Transocean Ltd. to Present at Howard Weil Energy Conference . Processed and transmitted by Thomson Reuters ONE. The issuer is solely responsible for the content of this announcement.

ZUG, SWITZERLAND--(Marketwire - March 13, 2013) - Transocean Ltd. (NYSE: RIG) (SIX: RIGN) today announced that Steven L. Newman, President and Chief Executive Officer of the company, will address attendees at the Howard Weil Energy Conference in New Orleans, Louisiana. Mr. Newman is scheduled to present on Monday, March 18, 2013, at 9:40 a.m., CT.

A copy of the presentation materials will be available on the company's website prior to the start of Mr. Newman's address on March 18, 2013, and will be accessible at www.deepwater.com. Go to the "Investor Relations" link, select "News & Events" and then select "Presentations." Howard Weil conference organizers are not offering a webcast or replay of this presentation.

Important Additional Information The company, its directors and certain of its executive officers and employees may be deemed to be participants in the solicitation of proxies from shareholders in connection with the company's 2013 Annual General Meeting (the "2013 Annual General Meeting"). The company plans to file a proxy statement with the SEC in connection with the solicitation of proxies for the 2013 Annual General Meeting (the "2013 Proxy Statement"). SHAREHOLDERS ARE URGED TO READ THE 2013 PROXY STATEMENT (INCLUDING ANY AMENDMENTS OR SUPPLEMENTS THERETO) AND ANY OTHER RELEVANT DOCUMENTS THAT THE COMPANY WILL FILE WITH THE SEC WHEN THEY BECOME AVAILABLE BECAUSE THEY WILL CONTAIN IMPORTANT INFORMATION. Additional information regarding the identity of these potential participants, none of whom owns in excess of 1 percent of the company's shares, and their direct or indirect interests, by security holdings or otherwise, will be set forth in the 2013 Proxy Statement and other materials to be filed with the SEC in connection with the 2013 Annual General Meeting. This information can also be found in the company's definitive proxy statement for its 2012 Annual General Meeting (the "2012 Proxy Statement"), filed with the SEC on April 6, 2012. To the extent holdings of the company's securities have changed since the amounts printed in the 2012 Proxy Statement, such changes have been or will be reflected on Statements of Change in Ownership on Form 4 filed with the SEC. Shareholders will be able to obtain, free of charge, copies of the 2013 Proxy Statement and any other documents, including the WHITE proxy card, filed by the company with the SEC in connection with the 2013 Annual General Meeting at the SEC's website (http://www.sec.gov), or at the company's website (http://www.deepwater.com), or by contacting the company by email at info@deepwater.com. In addition, copies of the proxy materials, when available, may be requested from the company's proxy solicitor, Innisfree M&A Incorporated, 501 Madison Avenue, 20th Floor, New York, NY 10022.

About Transocean Transocean is a leading international provider of offshore contract drilling services for oil and gas wells. The company specializes in technically demanding sectors of the global offshore drilling business with a particular focus on deepwater and harsh environment drilling services, and believes that it operates one of the most versatile offshore drilling fleets in the world.

Transocean owns or has partial ownership interests in, and operates a fleet of, 82 mobile offshore drilling units consisting of 48 High-Specification Floaters (Ultra-Deepwater, Deepwater and Harsh-Environment drilling rigs), 25 Midwater Floaters and nine High-Specification Jackups. In addition, we have six Ultra- Deepwater Drillships and three High-Specification Jackups under construction. For more information about Transocean, please visit the website at www.deepwater.com.

Analyst Contacts: Thad Vayda +1 713-232-7551

Diane Vento +1 713-232-8015

Media Contact: Guy A. Cantwell +1 713-232-7647

This announcement is distributed by Thomson Reuters on behalf of Thomson Reuters clients. The owner of this announcement warrants that: (i) the releases contained herein are protected by copyright and other applicable laws; and (ii) they are solely responsible for the content, accuracy and originality of the information contained therein.

Source: Transocean Ltd. via Thomson Reuters ONE [HUG#1685199]

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Transocean Ltd. Chemin de Blandonnet 10 Vernier Switzerland

ISIN: CH0048265513;

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   March 13, 2013 16:18 ET (20:18 GMT)- - 04 18 PM EDT 03-13-13