Far beneath the ocean's surface, an army of huge deep-water robots are waging a silent war against the oil gushing into the Gulf of Mexico. The robots, each of which can resist 5,000 pounds of pressure and lift up to a ton using their human-like arms, were originally developed during the Cold War to examine downed Soviet submarines. Now, they're at work on the seabed trying to hook up newly developed oil-recovery systems and build relief wells.

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