Even after a 100-ton box is in place over a blown-out oil well at the bottom of the Gulf of Mexico, it'll still take hours for underwater robots to secure it.
If all goes well, the device could then start trapping as much as 85 percent of the oil that's been flowing into the Gulf, andfunneling it up to a tanker.
But it's never been tried before so far below the surface, where the water pressure is enough to crush a submarine.
Meanwhile, a separate mission is close to getting under way to spray water around the rig that's drilling a relief well. The goal is to try to reduce the level of fumes from the thick oil that's hampering the crew's ability to do its work on deck.
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