GULF of MEXICO -Video acquired by a remotely operated vehicle is monitored and recorded onboard the motor vessel Viking Poseido. The video display shows a small pollution containment chamber, known as the "top hat," being lowered into the Gulf of Mexico by the motor vessel Viking Poseidon May 11, 2010. The chamber will be used in an attempt to contain an oil leak that was caused by the mobile offshore drilling unit Deepwater Horizon explosion. U.S. Coast Guard photo by Petty Officer 3rd Class Patrick Kelley.