In May 2007, the company announced another partial field shutdown owing to leaks of water at a separation plant. Their action was interpreted as another example of fallout from a decision to cut maintenance of the pipeline and associated facilities. On 16 October 2007 Alaska Department of Environmental Conservation officials reported a toxic spill of methanol at the Prudhoe Bay oil field managed by BP. Nearly 2,000 gallons of mostly methanol, mixed with some crude oil and water, spilled onto a frozen tundra pond as well as a gravel pad from a pipeline. Methanol, which is poisonous to plants and animals, is used to clear ice from the insides of the Arctic-based pipelines.
2010 Deepwater Horizon oil spill
On April 20, 2010, a semi-submersible exploratory offshore drilling rig in the Gulf of Mexico exploded after a blowout and sank two days later, killing eleven people and causing a massive oil spill threatening the coast of Louisiana, Mississippi, Alabama, Texas, and Florida.