Deepwater drilling contractor Transocean has secured a $252 million firm contract at the Shenandoah field in the U.S. Gulf of Mexico for its newbuild ultra-deepwater drillship, the Deepwater Atlas, including a mobilization fee of $30 million. “This award results from the final investment decision of [BOE Exploration & Production LLC (“BOE”)] and the Shenandoah working [&helli