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Earlier this year, divers finished welding a major portion of the 746-mile Langeled underwater gas pipeline, which snakes from a giant gas field in the Norwegian Sea to the U.K. The final step is to lay pipe through the Storegga Slide, a ragged maze of 200-foot peaks and 35-degree hills. To do it, engineers are are now peppering the seabed with 400 acoustic transponders. These will help create 3-D maps to guide shipboard technicians controlling two remotely operated vehicles as they clear away boulders and dig trenches 3,000 feet below. When gas starts flowing next year, the
$10-billion pipeline will provide one fifth of the U.K.’s natural gas. hydro.com/en
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