An offshore Louisiana oil rig slipped beneath the waves Thursday, threatening to create a huge oil spill and leaving 11 workers unaccounted for. Experts say the disaster highlights the dangers inherent in new deep-drilling techniques, which carry an increased risk of violent blowouts. "Offshore drilling has always been high-risk, but when you talk about wells going to these kinds of depths, the risks go even higher," says one analyst. "Once you go anywhere below 10,000 feet, all of a sudden the pressure and temperature become a lot more difficult to contend with."

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