Word: sonar
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Dates: during 1960-1969
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...Thresher eludes both Trieste and the oceanographers' instruments, the Navy has one more ace up its gold-braided sleeve. It has worked out a scheme for scuttling the decommissioned submarine Toro near the place where Thresher sank. As Toro settles through the water followed by sonar beams, she will tell how the currents affect a sinking submarine. Her crushed hulk lying on the bottom, its position pinpointed, will tell the dogged Navy, as it continues its search, what Thresher should look like to oceanographic instruments...
...hearings continued, so did the search for Thresher. The oceanic research vessel Atlantis II dropped cameras to see if one of a half-dozen ocean-bottom sonar "protuberances" might be the hull of Thresher. The bathyscaph Trieste, capable of plumbing depths of 35,000 feet, arrived in Boston, from where it would be shipped to seek the submarine's grave. And, for whatever reassurance it might be to men who serve aboard nuclear submarines, Rear Admiral Ralph K. James, head of the Navy Bureau of Ships, said that his experts were reviewing the design of Thresher class submarines...
Thresher's departure caused little excitement around the shipyard. Behind her were nine months of overhaul and modernization. New electronic and sonar gear had been installed. To put in the intricate equipment, several holes had been cut in the boat's hull-the largest was a yard square, to make way for an improved garbage ejector...
...klaxon blared, and she buried her nose in the Atlantic for her first series of test dives-all shallow. She performed perfectly, and at 9 p.m. Tuesday headed for deep water 220 miles off Cape Cod. Next morning, with Skylark bobbing above and maintaining constant contact with sonar and telephone, Thresher glided through a set of medium-depth dives. Her skipper, Lieut. Commander John Wesley Harvey, 35, decided that she was ready for the maximum test. None of this was new to him. An Annapolis graduate (eighth in the 696-member class of '50), he logged three years...
...Thresher was silent. Calmly at first, the Skylark tried to regain contact. Crewmen tried sonar, telephone and Morse code transmissions to raise Thresher. With growing fear, they began exploding small depth charges every ten minutes, hoping Commander Harvey would respond to those alarm signals. They kept up a drumfire of sonar and telephone messages-one every minute. But Thresher did not answer...