The company which owned the Deepwater horizon oil platform was an offshore-oil-drilling company called Transocean.
The Deepwater horizon oil spill is recognized as the largest accidental ocean spill in history. This incident occurred on April 20th, 2010, when, the Deepwater Horizon Oil Rig exploded.
The rig was owned by oil-drilling company called Transocean, and was leased to BP oil company. The oil spill was caused by a surge of natural gas that blasted through the concrete core of the oil well.
Later, an underwater camera revealed that the oil well was leaking oil and natural gas onto the ocean floor which was 42 miles off the coast of Louisiana. By the time this news got out, an estimated 3.19 million barrels of oil had leaked into the Gulf of Mexico.
Hence, the answer was given and explained above.
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