As world leaders gather to address a global marine crisis at the UN Ocean Conference, scientists from the Woods Hole Oceanographic Institution demonstrate promising tech to monitor and restore dying reefs.By Teresa TomassoniST. JOHN, U.S. Virgin Islands—Thirty-five feet deep in clear turquoise waters, a three-foot-long yellow underwater robot maneuvers over a coral reef at a popular snorkeling site named Tektite. 

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