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9. Odyssey

Oil Spilled: 1.02 million barrels
Cost in 2010: $86.7 million

In November 1988, the American-owned Odyssey drilling rig dumped more than 1 million barrels of crude oil after an explosion 700 miles off Canada's east coast, although most of the oil burned off before salvage and containment efforts could mobilize.

Photo: Paul Edmondson | Stockbyte | Getty Images