Transocean in Carbon Disclosure Project 2009

Transocean Ltd. (NYSE:RIG) said it has been ranked among the world's top 50 companies in the recently issued Carbon Disclosure Project (CDP) 2009 Global 500 Report.

For the second consecutive year, Transocean was featured in CDP's "Carbon Disclosure Leadership Index." This index, a key component of CDP's annual Global 500 Report, which represents 475 institutional investors with $55t in assets under management, highlights the constituent companies within the FTSE Global 500 Index which have displayed the most professional approach to corporate governance in respect of climate change disclosure practices.

Companies are scored on their climate change disclosure and high scores indicate good internal data management and understanding of climate-change related issues affecting the company.

In addition to this listing, Transocean also ranked as one of the top three companies in the new CDP Performance Scoring Initiative for the energy sector along with Royal Dutch Shell and Total. Transocean was also recognized as the top-performing energy sector company in the CDP's S&P 500 Performance Scoring Initiative.

The index, compiled by PricewaterhouseCoopers (PwC) on behalf of CDP provides an evaluation tool for institutional investors. It comprises 50 constituents of the Global 500 Index based on analysis of the responses to CDP's 2009 Questionnaire which focused on greenhouse gas emissions, emissions reduction targets and risks and opportunities associated with climate change.

(www.cdproject.net)