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Unidentified submerged object
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An unidentified submerged object, or USO, is any object or optical or mechanical detection phenomenon of unknown origin observed under water that remains unidentified even after thorough investigation. This particular use of the acronym should not be confused with USO, the popular abbreviation of the United Services Organization. The maritime analog to UFOs, or unidentified flying objects, unidentified submerged objects are often seen by those who study unidentified flying objects as a related phenomenon (ufologists). Likewise, many sightings of USOs constituting "typical" UFOs emerging from the water are seen as a subset of the latter rather than of the former. Other reports *In May 1958 (17 days), in October 1959 (five days) and January 1960 (24 days) in Golfo Nuevo (Argentina), an unidentified submarine was hunted by up to 14 Argentine warships (including an aircraft carrier) as well as over 30 navy planes. The submarines, though audible and occasionally visible to the naked eye, could not be triangulated by sonar, sonar buoys, hydrophones or radar. Despite intense bombing and depth-charging by the most up-to-date US explosives, torpedoes and naval gunfire, it proved impossible to damage or sink the submarines, and the hunt was abandoned on each occasion without success. Capt. Ray M Pitts, the leader of the U.S. Navy anti-submarine warfare team involved in the third hunt, confirmed afterwards that it had been a definite submarine, but he was prevented from saying more. Some sailors and eyewitnesses described it as a Type XXI U-boat developed by the German Navy 15 years earlier. *In 1966, an Australian banana farmer claimed to witness a USO emerge from a nearby swamp *In 1967, a fleet of Brazilian ships was followed by a submerged USO for several minutes *In Sweden in 1999, a supposed USO crashed into a lake, with spectators nearby In popular culture *The Abyss, a James Cameron sci-fi film *The Kraken Wakes, a post-apocalyptic novel by John Wyndham *X-COM: Terror from the Deep, a computer game about USOs *Twenty Thousand Leagues Under the Sea *Invasion, an ABC sci-fi drama television series
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