Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The UDAV-1 system is a Russian ship-borne Anti-submarine weapon system. The weapon fires a number of different types of rockets, which in addition to attacking submarines provide a multi-layer defence against torpedoes and frogmen. The system operates in conjunction with the ship''s sonar. An anti-submarine weapon is any one of a range of devices that are intended to act against a submarine, and its crew, to destroy (sink) the vessel or to destroy or reduce its capability as a weapon of war. An anti-submarine weapon can be integrated with an anti-submarine warfare (ASW) system, such as the US Navy Tactical Data System (NTDS) that controls air, land and sea-based weapon system threat detection and target acquisition. However, in its simplest sense it is a projectile, missile or bomb that is optimized to destroy submarines.