2010 – The Deepwater Horizon drilling rig explodes in the Gulf of Mexico, killing eleven workers and beginning an oil spill that would last six months
. The Deepwater Horizon was a floating semi-submersible drilling unit — a fifth-generation, ultra-deepwater, dynamically positioned, column-stabilized drilling rig owned by Transocean and built in Korea. The platform was 396 feet long and 256 feet wide and could operate in waters up to 8,000 feet deep, to a maximum drill depth of 30,000 feet. The explosion caused the Deepwater Horizon to burn and sink, resulting in a massive offshore oil spill in the Gulf of Mexico, considered the largest accidental marine oil spill in the world, and the largest environmental disaster in U.S. history.