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Summary:Science documentary series. The facts behind the oceanic whirlpool, a rare natural phenomenon which has inspired legends of sea monsters, with visits to whirlpools at Corryvreckan in Scotland, Norway's Lofoten Islands, Saltstraumen in Norway, Vancouver Island in Canada, the Science University of Tokyo where Professor Tsukasa Nishimura has studied the phenomenon, and the Scripps Institute of Oceanography in San Diego, California, where Professor Walter Munk talks about whirlpools so vast that they can only be seen from space.