Eltanin Antenna

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USNS Eltanin Photo (1964)
USNS Eltanin Photo (1964)

Eltanin Antenna is the name popularly given to an unusual 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 13,500 feet (4115 metres), some have suggested that it might be an artifact from a forgotten high-tech civilization, was brought to earth by aliens, or brought from the future by our descendants.

However, it has subsequently been identified as an example of the sponge Cladorhiza concrescens, first identified by Alexander Agassiz in a dredged-up sample in 1888.

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