Doesn’t mitigate the extent of this disaster, but it is good to at least have an idea about what caused the blowout in the first place.
From the link:
The deadly blowout of an oil rig in the Gulf of Mexico was triggered by a bubble of methane gas that escaped from the well and shot up the drill column, expanding quickly as it burst through several seals and barriers before exploding, according to interviews with rig workers conducted during BP’s internal investigation.
While the cause of the explosion is still under investigation, the sequence of events described in the interviews provides the most detailed account of the April 20 blast that killed 11 workers and touched off the underwater gusher that has poured more than 3 million gallons of crude into the Gulf.
Also from the link, sounds like a very frightening few moments on the rig:
As the bubble rose up the drill column from the high-pressure environs of the deep to the less pressurized shallows, it intensified and grew, breaking through various safety barriers, Bea said.
“A small bubble becomes a really big bubble,” Bea said. “So the expanding bubble becomes like a cannon shooting the gas into your face.”
Up on the rig, the first thing workers noticed was the sea water in the drill column suddenly shooting back at them, rocketing 240 feet in the air, he said. Then, gas surfaced. Then oil.
“What we had learned when I worked as a drill rig laborer was swoosh, boom, run,” Bea said. “The swoosh is the gas, boom is the explosion and run is what you better be doing.”
The gas flooded into an adjoining room with exposed ignition sources, he said.
“That’s where the first explosion happened,” said Bea, who worked for Shell Oil in the 1960s during the last big northern Gulf of Mexico oil well blowout. “The mud room was next to the quarters where the party was. Then there was a series of explosions that subsequently ignited the oil that was coming from below.