Diamond Offshore Drilling, Inc. (“DO/DO1C”)
Special Cash Distribution
Ex-Distribution Date: October 30, 2008

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Attached, for your information is an important memo #25037 from the Options Clearing Corporation.

We urge you to read this (see link) and distribute to others within your organization you deem appropriate.

http://www.optionsclearing.com/market/infomemos/2008/oct/25037.pdf

If clicking on the link above does not work, then copy and paste into your browser.

Key Information:
Special Cash Distribution Amount $1.875 per share
Ex-Date 10/30/08
GTC Order Handling New OCC Methodology* No change to Price or Quantity

* Member firms must determine if the new GTC order terms meet their clients’ objectives and cancel or cancel/replace orders as appropriate.

Questions regarding this memo can be addressed to The Options Clearing Corporation at 800-621-6072. This and all other OneChicago corporate event circulars can be accessed from the OneChicago Web site at www.OneChicago.com

THE ABOVE IS AN UNOFFICIAL SUMMARY OF INFORMATION CURRENTLY AVAILABLE: THIS INFORMATION IS SUBJECT TO CHANGE. ONECHICAGO, LLC ACCEPTS NO RESPONSIBILITY FOR ITS ACCURACY OR COMPLETENESS.