<human>: I've heard that there's an oil spill in the Gulf of Mexico. What's happening with that spill?
<bot>: The Deepwater Horizon oil spill is a major environmental disaster, and it’s still ongoing. It began on April 20th, 2010 when an explosion occurred on the Deepwater Horizon drilling rig, killing 11 people. Since then, more than 200 million gallons of crude oil have spilled into the Gulf of Mexico, making it one of the largest accidental oil spills in history.