Efforts to stem the Deepwater Horizon oil spill on top of which the new cap was located. The well integrity test was scheduled to take place after the installation of a three-ram capping stack over the lower marine riser package of the Deepwater Horizon semi-submersible rig on . On July 14, BP announced that the test would be delayed under Allen's orders; oil continued to flow into the Gulf. On July 15, 2010, BP announced that it had successfully plugged the oil leak using a tightly fitted cap. The cap, weighing 75 tons and standing high, is now bolted to the failed blowout preventer. It consists of a
Deepwater Horizon oil spill more than wide and deep. In a major study on the plume, experts were most concerned about the slow pace at which the oil was breaking down in the cold, water at depths of . In late 2012, a study from Georgia Tech and Universidad Autonoma de Aguascalientes in Environmental Pollution journal reported that Corexit used during the BP oil spill had increased the toxicity of the oil by 52 times. The scientists concluded that "Mixing oil with dispersant increased toxicity to ecosystems" and made the gulf oil spill worse." The three basic approaches for removing the oil from the