Word: sonar
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...including the possibility that a spare engine being carried under the plane's right wing might have had something to do with the crash. Although hopes had been slim that the two flight recorders could be found at an estimated depth of 6,000 ft., at week's end sonar scanners aboard a British seabed operations vessel, H.M.S. Challenger, detected a firm signal that Irish authorities identified as the recorders' "homing blip...
Arthur Walker taught antisubmarine warfare tactics at the Atlantic Fleet Tactical School in Norfolk from 1968 until his retirement in 1973. Entering the Navy in 1954, he had served as a sonar operator on three subs before winning his commission. His subsequent duties included those of navigator, officer in charge of communications, engineering officer and executive officer on various submarines. When he retired, he quickly found a civilian job as an engineer with VSE Corp., a Navy contractor with regional headquarters in Chesapeake, Va. He worked on plans for the maintenance of Navy carriers and amphibious ships...
...neighbors. Though it has an impressive force of 100 diesel-powered submarines and at least two Han-class nuclear-powered attack subs, China does not have a navy capable of projecting power worldwide. The conventional subs cannot venture far beyond coastal waters and are highly vulnerable to sonar detection. Nonetheless, China's navy has been receiving the lion's share of modernization funds. Its current manpower of 360,000 is more than double its 1970 strength, and the number of Chinese combat vessels has tripled to more than 300 since 1980. Behind the sped-up naval expansion program...
...spent $75,000 to find the wreck, and will spend a million more to complete the salvage. The payoff: $5 million to perhaps $500 million, of which Delaware will claim 25%. About $50,000 of the salvor's initial investment went for one indispensable tool: side-scanning sonar of the type used by U.S. Navy ships searching for Korean Air Lines Flight 007 in the Sea of Japan last year. Mounted in a torpedo-shaped housing, the side-scanner emits pulses horizontally as well as vertically. It is towed behind a search ship, which methodically crisscrosses a designated area...
...commercial uses, such as seabed mining and pipeline building, have made it possible to salvage deep-water wrecks. A notable example: H.M.S. Edinburgh, a British cruiser that sank after a Nazi attack in the Barents Sea north of Murmansk, U.S.S.R., during World War II. The Edinburgh was located with sonar devices in 1981. Then, in what the London Sunday Times called "the greatest salvage operation in the annals of the sea," British salvors brought up most of her five-ton cargo of gold from icy waters 800 ft. deep. Hot water was constantly circulated through their diving suits to ease...