Second-Worst: The BP Deepwater Horizon Spill In late April, 2010, global oil company BP was operating the oil-drilling rig Deepwater Horizon in the Gulf of Mexico when a sudden surge of natural ...

It's unclear where exactly the oil spill came from. The Massachusetts Environmental Police said it seems to have come from upstream, then flowed into the Muddy River and Leverett Pond.

Sable Offshore Corp. has restarted offshore oil production 10 years after the operation was shuttered following a major oil spill along Santa Barbara's coast.