A Nuclear Depth Bomb (NDB) is the nuclear equivalent of the conventional depth charge and can be used in Anti-Submarine Warfare (ASW) for attacking submerged submarines. The British Royal Navy, Soviet Navy and United States Navy had nuclear depth bombs in their arsenals at one point. Due to the use of a nuclear warhead of much greater explosive power than that of the conventional depth charge, the Nuclear Depth Bomb considerably increases the likelihood (to the point of near certainty) of the destruction of the attacked submarine.