![]() By, the United States Coast Guard (USCG) estimated that 170 vessels, and nearly 7,500 personnel were participating, with an additional 2,000 volunteers assisting. By 29 April 69 vessels, including skimmers, tugs, barges, and recovery vessels, were in use. Initially, BP employed remotely operated underwater vehicles (ROV's), 700 workers, 4 airplanes, and 32 vessels. The response increased in scale as the spill volume grew. ![]() On 28 April, the US military joined the cleanup operation. On, BP began documenting the daily response efforts on its web site. "That type of mixture essentially removes all the best oil clean-up weapons", Overton said. Once it becomes emulsified, it no longer evaporates as quickly as regular oil, does not rinse off as easily, cannot be broken down by microbes as easily, and does not burn as well. According to Ed Overton, who heads a federal chemical hazard assessment team for oil spills, this type of oil emulsifies well. While most of the oil drilled off Louisiana is a lighter crude, the leaking oil was of a heavier blend which contained asphalt-like substances. A variety of techniques were used to address fundamental strategies for addressing the spilled oil, which were: to contain oil on the surface, dispersal, and removal. The Deepwater Horizon oil spill occurred between 10 April and 19 September 2010 in the Gulf of Mexico. United States Environmental Services workers prepare oil containment booms for deployment
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