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There have been numerous devastating oil spills around the world since 1967. The largest was in 1991, during the Persian Gulf War, in which an estimated 380 to 520 million gallons of oil was deliberately spilled by Iraqi forces into the Persian Gulf. This was done in a bid to stop U.S. and coalition forces landing, with oil slicks in some areas as thick as five inches.
The most recent major oil spill occurred on April 22, 2010, when an explosion on BP's Deepwater Horizon rig caused some 206 million gallons of oil to spill into the Gulf of Mexico until it was eventually plugged on July 15, 2010.