k this is the one active torpedo defence on Indian ships as well as on Russian ships …. from BR

RBU-6000 Rocket Launcher

The RBU-6000 rocket launcher is fitted with 12 radially arranged tubes which contains the RGB-60 depth charge rocket. It is an unguided solid propellant projectile with an impact time fuse, which can be switched to impact or impact-time ignition. The maximum firing range is 6000 meters and maximum target submarine engagement depth is 500 meters. The rocket weighs 110 kg which includes a 25 kg explosive weight.

The fire control system provides all the necessary data on the state of the launchers, mutual position of the host ship & target submarine and generates the firing data. The system transmits the data on the necessary laying angles to the launchers, ensures remote input of burst type & depth to the rockets and the command as to the number of rockets to be fired in a ripple of one, four, eight or twelve firings.