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The "Eltanin Antenna" is an object photographed on the sea floor by the Antarctic oceanographic research ship USNS ''Eltanin'' in 1964, while photographing the sea bottom west of Cape Horn. Due to its regular antenna-like structure and upright position on the seafloor at a depth of 3,904 metres, some proponents of fringe and UFO-related theories including Bruce Cathie have suggested that it might be an extraterrestrial artifact. Other authorities have suggested that the object photographed by the ''Eltanin'' was an unusual carnivorous sponge, ''Chondrocladia concrescens'' (formerly ''Cladorhiza concrescens''). ==History== The 1,850 ton displacement ''Eltanin'' was originally launched in 1957, and served with the US Navy as a cargo-carrying icebreaker. In 1962 she was reclassified as an Oceanographic Research Ship and became the world's first dedicated Antarctic research vessel, a role which she filled until 1975. On 29 August 1964, while engaged in taking sample cores and photographing the seabed west of Cape Horn, the ''Eltanin'' took the photograph reproduced in this article, at position 59:07'S 105:03'W, in a depth of 3,904 metres. The first public mention of the unusual subject of the photograph was a news item which appeared in the ''New Zealand Herald'' on 5 December 1964, under the heading "Puzzle Picture From Sea Bed". In 1968, author Brad Steiger wrote an article for ''Saga'' magazine, in which he claimed that the ''Eltanin'' had in fact photographed "an astonishing piece of machinery... very much like the cross between a TV antenna and a telemetry antenna". 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Eltanin Antenna」の詳細全文を読む スポンサード リンク
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