The Soviet Polyus satellite was a prototype orbital weapons platform measuring 37 m (121 ft 4 in) long, 4.1 m (13 ft 5 in) in diameter and with a mass of 80 tonnes (176,370 lb). It was equipped with an anti-satellite recoilless cannon, a sensor blinding laser to confuse hostile satellites and a nuclear space mine launcher. Only one was ever launched, on 15 May 1987. It failed to reach orbit and crashed into the Pacific Ocean. It is unclear which weapon systems from its design it was launched with.