The Soviet Union lost at least four submarines during this period: ship Soviet submarine K-129 1960 2 was lost in 1968 (a part of which the CIA retrieved from the ocean floor with the Howard Hughes-designed ship Glomar Explorer), ship Soviet submarine K-8 2 in 1970, ship Soviet submarine K-219 2 in 1986, and ship Soviet submarine Komsomolets 2 in 1989 (which held a depth record among military submarines— 1000 meters ).