Aerial view of the Discoverer Enterprise

Aerial view of the Discoverer Enterprise deepwater drillship (which is capable of drilling a well more than 6.5 miles beneath its drill floor), at the site of the BP Deepwater Horizon platform disaster in the Gulf of Mexico off the coast of Louisiana on May 9, 2010. BP was dealt a setback May 8 to capping a massive oil spill in the Gulf of Mexico after a containment dome encountered flammable hydrate formations as it was lowered onto the leak site. The gas hydrates, similar to ice crystals, formed on the inside of the 100-ton (90-tonne) chamber as it neared the seabed nearly a mile (1,500 meters below the surface, making it too buoyant and clogging it up, BP chief operating officer Doug Suttles told reporters. Workers have moved the concrete and steel box some 650 feet (200 meters) to the side on the seabed while they evaluate their options. AFP PHOTO/Mark RALSTON (Photo credit should read MARK RALSTON/AFP via Getty Images)