Final answer:
The largest recorded oil gusher resulted from the Deepwater Horizon oil drilling rig blowout on April 20, 2010, in the Gulf of Mexico, spilling approximately 4.9 million barrels of oil over 87 days until it was sealed on September 19, 2010.
Step-by-step explanation:
The largest recorded oil gusher, also called the Deepwater Horizon oil spill, was not found but instead was the result of an accident. The blowout of the Deepwater Horizon oil drilling rig on April 20, 2010, in the Gulf of Mexico near Mississippi, triggered the gusher. It became the largest marine oil spill in the history of the petroleum industry. An estimated 4.9 million barrels of oil flowed from the ruptured well located 5000 feet below the water's surface for 87 days until the well was sealed on September 19, 2010. The oil, being immiscible with water and less dense, rose to the surface, creating a vast environmental disaster.