The stakes couldn't be higher.
After six weeks of failures to block the well or divert the oil, the latest mission involved using a set of tools akin to an oversized deli slicer and garden shears to break away the broken riser pipe so engineers can then position a cap over the well's opening.
But it's a big gamble: Even if it succeeds, it will temporarily increase the flow of an already massive leak by 20 percent -- at least 100,000 gallons more a day. That's on top of the estimated 500,000 to 1 million gallons gushing out already.
In Florida, officials confirmed an oil sheen about nine miles from the famous white sands of Pensacola beach. Crews shored up miles of boom and prepared for the mess to make landfall as early as Wednesday.
Florida would be the fourth state hit. Crude has already been reported along barrier islands in Alabama and Mississippi, and it has impacted some 125 miles (201 kilometers) of Louisiana coastline.
More federal fishing waters were closed, too, another setback for one of the region's most important industries. More than one-third of federal waters were off-limits for fishing, along with hundreds of square miles of state waters.
BP's stock nose-dived on Tuesday, losing nearly 15 percent of its value on the first trading day since the previous best option -- the so-called top kill -- failed and was aborted at the government's direction. It dipped steeply with Holder's late-afternoon announcement, which also sent other energy stocks tumbling, ultimately causing the Dow Jones industrial average to tumble 112.If BP's new effort to contain the leak fails, the procedure will have made the biggest oil spill in U.S. history even worse.
It is an engineer's nightmare. They're trying to fit a 21-inch cap over a 20-inch pipe a mile away. That's just horrendously hard to do. It's not like you and I standing on the ground pushing -- they're using little robots to do this.
Since the Deepwater Horizon rig exploded on April 20, eventually collapsing into the Gulf of Mexico, an estimated 20 million to 40 million gallons (76 million to 151 million liters) of oil has spewed, eclipsing the 11 million that leaked from the Exxon Valdez disaster.
BP PLC's Doug Suttles said that although there's no guarantee the company's latest cut-and-cap effort to close off the leak will work, he remained hopeful, but wouldn't guarantee success.
Engineers have put underwater robots and equipment in place this week after a bold attempt to plug the well by force-feeding it heavy mud and cement -- called a "top kill" -- was aborted over the weekend. Crews pumped thousands of gallons of the mud into the well but were unable to overcome the pressure of the oil.
The company said if the small dome is successful it could capture and siphon a majority of the gushing oil to the surface. But the cut and cap will not halt the oil flow, just capture some of it and funnel it to vessels waiting at the surface.
The British oil giant has tried and failed repeatedly to halt the flow of the oil, and this attempt like others has never been tried before a mile beneath the ocean. Experts warned it could be even riskier than the others because slicing open the 20-inch (51-centimeter) riser could unleash more oil if there was a kink in the pipe that restricted some of the flow.
But BP's best chance to actually plug the leak rests with a pair of relief wells but those won't likely be completed until August.The company has carefully prepared the next phase, knowing that another failure could mean millions more gallons spew into the ocean and lead to even more public pressure. And they say they have learned valuable lessons from the failure of a bigger version of the containment cap last month that was clogged with icelike slush.
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