Where is the oil leak on Gulf of Mexico coming from?

There was a massive oil spill in the Gulf of Mexico in 2010 when the Deepwater Horizon oil rig exploded and sank, causing an oil leak that lasted 87 days and released an estimated 4.9 million barrels of oil into the ocean. The oil leak was stopped on July 15, 2010, when the relief well was completed and oil flow was stopped.