Mad Dog's drilling derrick, which sits atop the platform, was toppled and is on the sea bed. BP safely evacuated all workers from Gulf of Mexico offshore operations on Tuesday, Sept. 9 and safely ...

Used to rotate the drill string during the drilling process, the top drive is a motor that is suspended from the derrick, or mast, of the rig. These power swivels boast at least 1,000 horsepower ...