The spill began after an April 20 explosion on the offshore drilling platform Deepwater Horizon that killed 11 men.

CNN: STORY HIGHLIGHTS

In effect, the personnel on the BP oil drilling platform, Deepwater Horizon, were poorly prepared for events that took place on April 20, 2010.

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The Plan C drill -- an enormous oil drilling platform that dominates the rescue site -- had reached 156 meters (512 feet), Sougarret said.

CNN: STORY HIGHLIGHTS

It required that as soon as Davy Jones was perforated and a flare came up the hole, the rig had to be backed away from the drilling platform.

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Each drilling platform idled by the ban puts 1, 400 jobs at risk, according to the National Ocean Industries Association (NOIA), a group of drillers and companies that support oil production.

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Eleven people died at the Deepwater Horizon drilling platform.

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Visitors to an offshore drilling rig or production platform receive safety training and are outfitted with steel-toed boots, safety goggles, gloves, hearing protection, and a helmet.

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The Deepwater Horizon Oil Spill began in the Gulf of Mexico on April 20th with a drilling rig explosion that killed eleven platform workers and injured seventeen others.

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