At 21:00 on September 5, 1914, the German submarine U-21 sank the cruiser Pathfinder and 259 sailors of the Royal Navy with just one torpedo
After that event, submarines have really become a great threat to all the most powerful fleets in the world
Since then, the research and development of anti-submarine weapons was an urgent requirement for the navies
Anti-submarine weapons really flourished during the second world war and the cold war
When it comes to the development of modern anti-submarine weapons
it is impossible not to mention the Soviet RBU systems, one of which is still very popular today, the RBU-6000
The RBU-6000 entered service with the Soviet Navy Fleet in 1961
At the moment, RBU-6000 is an operational, time-tested installation of an anti-submarine torpedo defense system
One of the oldest in its class, and featured on most of the later Russian surface warships and its counterparts
RBU-6000 was designed as a 213 mm caliber anti-submarine rocket launcher
It is similar in principle to the Royal Navy Hedgehog system used during the Second World War
It consists of a horseshoe-shaped arrangement of twelve launch barrels, that are remotely directed by the Burya fire control system
RBU-6000 fires RGB-60 unguided depth charges
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
RGB-60 is an unguided rocket using a solid propellant engine
The Rocket carries a 23 kg warhead, has a maximum range of up to 5,500m, destroys targets at a depth of 10-500m