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Critics of a Navy plan to use dolphins and sea lions to guard waters off the coast of a major submarine base say the ocean is too cold for the plan to work.
The animals are trained to alert a handler when they detect anyone in the water. The handler, in a small boat, then places a strobe light on the nose of the animal, which speeds back and bumps the swimmer. The bump knocks the light into the water, where it floats to mark the spot for security personnel to intercept the intruder.
Navy officials note that dolphins and sea lions have guarded the shoreline at a similar sub base in Kings Bay, Ga., for two years.