In this undated file photo released by Transocean, the ultra-deepwater semi-submersible rig Deepwater Horizon is shown operating in the U.S. Gulf of Mexico. Authorities were searching for missing workers early Wednesday April 21, 2010 who evacuated after an explosion at the oil drilling platform off the coast of Louisiana. The explosion happened around 10 p.m. Tuesday, 52 miles southeast of Venice, La., while 126 workers were aboard the platform, Coast Guard Senior Chief Petty Officer Mike O#39;
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Deepwater Horizon rig location
