"Transocean Ltd, the world's biggest offshore rig contractor, aims to stop a seventh U.S. body from investigating the accident that sank one of its rigs while causing the largest U.S. offshore oil spill.

In a letter to the Chemicals Safety Board (CSB) dated December 30, Transocean lawyer Rachel Clingman repeated a request for documents as the company tries to demonstrate that the CSB lacks jurisdiction over April's Deepwater Horizon disaster. ...

Clingman had argued in a December 2 letter, which was released to reporters along with the latest correspondence, that the rig was not subject to CSB scrutiny because it was not a fixed source."

Braden Reddall reports for Reuters December 31, 2010. [2]