Word: sonar
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Dates: during 1980-1989
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...dispatched four Sea Stallion helicopters, support equipment and about 200 men to join the search. Their mission was not just to destroy the mines but to find and analyze them first. A Sea Stallion, flying at an altitude of 200 to 300 feet, uses a "sled" to tow a sonar detecting system through the water. Once a suspected mine is located, the unit sends divers down to take a look at the object...
Using special underwater electronic location devices, sonar and TV-equipped, deep-diving, remote-controlled submersible craft, the two main U.S. search vessels, the U.S.N.S. Narragansett and the U.S.S. Conserver, at times seemed tantalizingly close to their targets. At least twice the ships picked up the distinctive "ping" of special electronic signaling devices within the boxes, which are audible up to five miles under water. The sounds were coming from a depth of about 2,500 ft. Each time, contact was lost...
...Lines Flight 007. The flight data inside would probably answer some of the questions about how and why the wayward aircraft met its fate. The waterproof container is heavily reinforced to survive impact and ocean depths down to 20,000 ft. For 30 days it will automatically emit a sonar signal that can be heard for up to five miles under water. Many of these boxes have been recovered in the past, but if the one from KAL Flight 007 is in Soviet waters it may never be made available to the U.S. or Korea for analysis. Even...
...harbor during a visit by the U.S. fleet last September. The vessel came within one mile of King Carl XVI Gustaf's palace on an island in the center of the capital (see map). The Swedish navy also attributes the failure of the October search to the minisubs. "Sonar didn't work where they were concerned," says Vice Admiral Bror Stefenson. "If they had been the normal size they wouldn't have got away...
Meanwhile, new information has become available on the discovery of the latest sub-surface invasion. A Swedish fisherman claimed to have first sighted a foreign vessel in the Musko port nearly four weeks ago, days before the navy began its fruitless depth-charge barrage and sonar search...