Transocean Announces Definitive Agreements to Sell 38 Shallow Water Drilling Rigs to Shelf Drilling

Transocean Ltd.

announced today that the company has reached definitive agreements to sell 38 shallow water drilling rigs to Shelf Drilling International Holdings, Ltd. ("Shelf Drilling") for approximately $1.05 billion. The list of rigs to be acquired by Shelf Drilling in the transactions is provided as Appendix A. Shelf Drilling is a newly formed company sponsored equally by Castle Harlan, Inc., CHAMP Private Equity and Lime Rock Partners.The sales price includes approximately $855 million in cash, subject to working capital and other closing adjustments, and $195 million in seller financing. Seller financing will be in the form of preference shares issued by an affiliate of Shelf Drilling. As a component of the agreement, Transocean will provide various transition support services to Shelf Drilling for a period subsequent to the closing of the transactions. The transactions are expected to close in the fourth quarter of 2012, subject to certain conditions."This agreement marks an important milestone in our asset strategy to increase our focus on high-specification floaters and jackups, improving our long-term competitiveness," said Steven L. Newman, President and Chief Executive Officer of Transocean Ltd.David Mullen, President and Chief Executive Officer