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Seafloor Sentinel

June 25, 2006

In 1998, the remotely operated vehicle (ROV) Jason installed the Hawaii-2 Observatory, or H2O, in 5,000 meters (about 16,400 feet) of water using an abandoned submarine telephone cable. Initial experiments monitored undersea earthquakes and sounds. (Illustration by Jayne Doucette, Woods Hole Oceanographic Institution)