Transocean Notes Impairment Charge

Transocean expects its fourth quarter 2010 results to include an after-tax non-cash charge of $1.009 billion, or $3.16 per diluted share, resulting from the impairment of the Standard Jackup fleet. The impairment is due to projected declines in dayrates and utilization, which adversely impacted this asset group, and is calculated in accordance with U.S. generally accepted accounting principles.

This impairment charge is based on current estimates and is subject to change. Transocean's fourth quarter and full-year 2010 results are expected to be released on February 23, 2011.