On 20 April 2010 , while drilling at the Macondo Prospect , an uncontrollable blowout caused an explosion on the rig that killed 11 crewmen and ignited a fireball visible from away . The fire was inextinguishable and , two days later , on 22 April , the '' Horizon '' sank , leaving the well gushing at the seabed and causing the largest oil spill in U.S. waters
the largest oil spill in U.S. waters
Deepwater Horizon oil spill
Deepwater Horizon