Four years ago methane caused an oil rig exploded into flames causing the semi-submersible rig called Deepwater Horizon to sink to the sea floor after failing to extinguish it. After the predicament it was discovered that an oil leak deep underwater spilled out toxic chemicals that harmed the marine life. Up to today the BP spill is considered one of the worst oil spills that ever occurred, pumping out an estimate of 1,000 to 5,000 continuously for 3 months.
