Parthian-class submarine launched in 1929 and sunk in 1931 Poseidon (A-12), a Spanish Navy salvage and support vessel for submarines BN Poseidon was 1951–1959 a coastal tanker launched in 1942 as Empire Faun SS Poseidon was 1968–1969 a steam cargo ship launched in 1941 as Empire Ballard ST Poseidon was 1973–1976 a steam tug launched in 1941 as Empire Fir , a U.S. Navy Achelous-class repair ship launched in 1944 and sold in 1961 , a Gato-class submarine Poseidon-class submarine, a Greek submarine class Computing and technology PoSeidon (Malware), a virus targeting point-of-sale computer systems Poseidon drowning detection system, computer aided swimming pool safety equipment Poseidon Linux, an operating system Poseidon, a specific implementation of the ISO 8583 electronic payment protocol Poseidon, a series of space-based radar altimeters Poseidon-1, a CNES-built Ku-band radar altimeter aboard TOPEX/Poseidon oceanographic satellite Poseidon-2, a radar altimeter on board the Jason-1 oceanographic satellite Poseidon-3, a radar altimeter on board the OSTM/Jason-2 oceanographic satellite Poseidon-3B, a radar altimeter on board the Jason-3 oceanographic satellite Other uses Poseidon bubble, an Australian stock market bubble Poseidon, the Boardwalk Hall Auditorium Organ in Atlantic City, New Jersey Poseidon (species), species with the specifier poseidon See also The Poseidon Adventure (disambiguation) Poseidonia (disambiguation) Posidonia (disambiguation)