Submersibles, both remotely operated and autonomous, have been used for both scientific research purposes and private enterprise for several decades. They have studied life on the barren intercontinental plains, have explored volcanic vents in the middle of the Atlantic Ocean, and have gone places impossible for humans to go. In the commercial world, they were thrust into the spotlight during the Deepwater Horizon oil disaster in 2010. A fleet of submersibles was used to cap the oil well and stop the spill in 5,000-foot depths—far below what human divers could reach. They are routinely used to conduct maintenance on deep-sea oil rigs and offshore wave farms.