The 25-page complaint, filed by U.S. Attorney Kenneth Magidson of Houston, alleges that Transocean failed to respond sufficiently to 38 of 39 specific demands contained in five subpoenas from the U.S. Chemical Safety and Hazard Investigation Board. A spokesman for Transocean referred to a July 2011 letter the company wrote to the Department of Justice regarding the subpoenas, which says only the U.S.