RPK-6M 'Waterfall' (SS-N-16 Stallion).
Soviet anti-submarine missile and torpedo system capable of hitting enemy submarines at a distance of up to 50 km.
The missile of the complex is launched from a 533 mm torpedo tube of a submarine or surface ship as a standard torpedo. In the water, at some distance from the carrier, the rocket turns on a solid-propellant jet engine, leaves the water and flies to a given area. There, the rocket drops a warhead, which splashes down by parachute. A nuclear charge or a 400-mm small-sized electric torpedo UMGT-1 is used as a warhead (range - 8 km, depth - up to 500 m, speed - 41 knots).
The stage of 'diving into the water' is due to the unification of the missile-torpedo for launching from both surface ships and submarines.
... and torpedo tubes with a target designation unit can be installed on any barge or pleasure boat. ;)