On April 20, 2010, a loss of well control occurred and resulted in an explosion and fire on the Mobile Offshore Drilling Unit Deepwater Horizon. Eleven lives were lost in this incident and the MODU subsequently sank. As of the date of this safety alert the well has not been secured, and the resulting release of oil has been declared a spill of national significance with oil threatening sensitive coastlines and resources in the Gulf of Mexico. At the time of the accident, the Deepwater Horizon was operating 52 miles from shore in 4,992 feet of water with a subsea BOP stack. After the Deepwater Horizon sank, ROV's confirmed that the riser was bent over and still attached to the BOP and that oil is flowing from leaks in the riser above the BOP.