The '''RBU-6000''' '''Smerch-2''' (Реактивно-Бомбовая Установка, ''Reaktivno-Bombovaja Ustanovka''; [[reaction engine]]-bomb installation & Смерч; waterspout) is a 213 mm caliber [[Soviet Union|Soviet]] rocket based [[anti-submarine ballisticunguided artilleryprojectiles]]. It is similar in principle to the [[Royal Navy]] [[Hedgehog (weapon)|Hedgehog]] system used during the [[Second World War]]. The system entered service in 1960–1961 and is fitted to a wide range of Russian surface vessels. It consists of a horseshoe-shaped arrangement of twelve launch barrels, that are remotely directed by the Burya fire control system (that can also control the shorter ranged [[RBU-1000]]). It fires [[RGB-60]] rockets, which carry unguided [[depth charge]]s. The rockets are normally fired in salvos of 1, 2, 4, 8 or 12 rounds. Reloading is automatic, with individual rounds being fed into the launcher by the 60UP loading system from a below deck magazine. Typical magazine capacity is either 72 or 96 rounds per launcher. It can also be used for shore bombardment.