Deepwater Horizon

Wikipedia:

An explosion on the Deepwater Horizon offshore drilling rig, operating in the Gulf of Mexico off the coast of Louisiana, on April 20, 2010, resulted in a fire that sank the rig and caused a massive-scale oil spill. Eleven rig workers are currently missing and presumed dead, the explosion also injured 17 others. The oil spill covers a surface area of at least 2,500 square miles (6,500 km2) according to estimates reported on May 3, 2010 by CNBC. The oil spill, originating from a deepwater oil well 5,000 feet (1,500 m) below sea level, is currently discharging an estimated 5–25 thousand barrels (210,000–1,100,000 US gallons; 790,000–4,000,000 litres) of crude oil daily. The spill is expected to eclipse the 1989 Exxon Valdez oil spill as the worst US oil disaster in history.