Science: Underwater High-Line

Sweden is building the world's longest underwater power transmission system. The cable itself, which has already been laid, runs 60 miles from the Swedish mainland to Visby on the Island of Gotland, and is nearly three inches in diameter at its thickest point. Its solid copper conductor, about ⅓ in. thick, will carry direct current at 100,000 volts. The return current flows back through the sea. The electrodes that start it on its water journey are screened to save the fish.

British experts are watching every step of the Swedish project. If it succeeds, it may be the model for a power...

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