On April 21, 2010 a momentous explosion occured on the oil rig "Deepwater Horizon" located in the Gulf of Mexico about 80 km off the coast of Louisiana, USA. The oil rig caught fire and 11 workers were missing after the incident and are believed to be dead. On the following day the oil rig sank to the seafloor about 1500 m below the surface and approximately 400 m northwest of the well. An estimation of up to 800.000 litres of oil are leaking from three places of the well and threaten the marine ecosystem of the Gulf of Mexico, the ecologically sensitive Mississippi