In the 20th century where did the most ecologically destructive oil spill in the US

1979 in the Gulf of Mexico 140 million gallons were spilled

Oil spills have been one of the most common forms of ecological destruction of marine life, most especially the coral reef systems. The presence of oil in the water surface would block sunlight and oxygen supply to the marine animals. Among the most destructive forms of oil spill as of recent date was the incident that happened in the Prince William Sound.