Scientists on a deep-sea expedition off Indonesia have discovered a towering volcano: It rises 10,000 feet (3,000 meters) from the ocean floor, yet remains far from sight at the water's surface.
US and Indonesian researchers, using a powerful sonar system and a robotic vehicle with high-definition video, are exploring terrain off Sulawesi island in hopes of getting a glimpse into complex and little-known marine ecosystems.
They have mapped 2,400-sq-miles (6,200 sq-kilometres) of sea floor since setting off last month, an area equal to the size of the US state of Delaware, according to a news release from the American embassy in Jakarta.
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