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A Trans-Atlantic floating tunnel carries 5000-mile-an-hour, Mag-lev (magnetically levitated) trains between New York, London and Paris. The train makes the 3100 mile journey in less than an hour. Passengers and freight travel in climate-controlled cars. The tunnel floats 150 feet under the North Atlantic's surface -- enough room for ships to pass safely overhead. The steel cables that tether the tunnel to the ocean floor are controlled by GPS and computers systems that can adjust the cables for shifts in ocean currents and tectonic plates. Passengers enjoy the comfort of specially designed seats that would relieve the effects of g-forces while whales and nuclear subs glide soundlessly around them. Prototypes are being built in Norway and Japan. Disaster is always possible. The Gulf Stream's massive current could bend and crack the tunnel. A nuclear sub could ram it. And if two trains were to collide and a fire broke out, or if the train's oxygen supply failed, the results could be cata