This week Congress continues its investigation, but Capitol Hill has not heard from the man "60 Minutes" correspondent Scott Pelley met: Mike Williams, one of the last crewmembers to escape the inferno.
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He says the destruction of the Deepwater Horizon had been building for weeks in a series of mishaps. The night of the disaster, he was in his workshop when he heard the rig's engines suddenly run wild. That was the moment that explosive gas was shooting across the decks, being sucked into the engines that powered the rig's generators.
"I hear the engines revving. The lights are glowing. I'm hearing the alarms. I mean, they're at a constant state now. It's just, 'Beep, beep, beep, beep, beep.' It doesn't stop. But even that's starting to get drowned out by the sound of the engine increasing in speed. And my lights get so incredibly bright that they physically explode. I'm pushing my way back from the desk when my computer monitor exploded," Williams told Pelley.
The rig was destroyed on the night of April 20. Ironically, the end was coming only months after the rig's greatest achievement.
Mike Williams was the chief electronics technician in charge of the rig's computers and electrical systems. And seven months before, he had helped the crew drill the deepest oil well in history, 35,000 feet.
"It was special. There's no way around it. Everyone was talking about it. The congratulations that were flowing around, it made you feel proud to work there," he remembered.
Williams worked for the owner, Transocean, the largest offshore drilling company. Like its sister rigs, the Deepwater Horizon cost $350 million, rose 378 feet from bottom to top. Both advanced and safe, none of her 126 crew had been seriously injured in seven years.
The safety record was remarkable, because offshore drilling today pushes technology with challenges matched only by the space program.
Deepwater Horizon was in 5,000 feet of water and would drill another 13,000 feet, a total of three miles. The oil and gas down there are under enormous pressure. And the key to keeping that pressure under control is this fluid that drillers call "mud."
"Mud" is a manmade drilling fluid that's pumped down the well and back up the sides in continuous circulation. The sheer weight of this fluid keeps the oil and gas down and the well under control.
The tension in every drilling operation is between doing things safely and doing them fast; time is money and this job was costing BP a million dollars a day. But Williams says there was trouble from the start - getting to the oil was taking too long.
Williams said they were told it would take 21 days; according to him, it actually took six weeks.
With the schedule slipping, Williams says a BP manager ordered a faster pace.
"And he requested to the driller, 'Hey, let's bump it up. Let's bump it up.' And what he was talking about there is he's bumping up the rate of penetration. How fast the drill bit is going down," Williams said.
Williams says going faster caused the bottom of the well to split open, swallowing tools and that drilling fluid called "mud."
"We actually got stuck. And we got stuck so bad we had to send tools down into the drill pipe and sever the pipe," Williams explained.
That well was abandoned and Deepwater Horizon had to drill a new route to the oil. It cost BP more than two weeks and millions of dollars.
"We were informed of this during one of the safety meetings, that somewhere in the neighborhood of $25 million was lost in bottom hole assembly and 'mud.' And you always kind of knew that in the back of your mind when they start throwing these big numbers around that there was gonna be a push coming, you know? A push to pick up production and pick up the pace," Williams said.
Asked if there was pressure on the crew after this happened, Williams told Pelley, "There's always pressure, but yes, the pressure was increased."
But the trouble was just beginning: when drilling resumed, Williams says there was an accident on the rig that has not been reported before. He says, four weeks before the explosion, the rig's most vital piece of safety equipment was damaged.