HMS M-1 (Picture 1) Kimmo Huosionmaa A major problem with submarines has always been that they could not attack against ground installations. So a couple of submarines have been equipped with very big cannons, what gave them the capacity to attack against the beach targets. The British “M-class" submarine with monstrous 305 mm (12 inches). cannon might seem like incredible and bizarre creature, what just waits for being struck. That submarine was created to destroy warships and beach bunkers during WW I and there were only three of those vessels what were accomplished after WW I. In those submarines were many problems, what caused two bad accidents, where all men of those submarines were killed. And this makes them very interesting creature for investigators. The idea of the submarine, what could also destroy beach bunkers would be very fascinated by the admirals of Royal Navy. But there were problems with the big gun of this submarine. HMS M-1 fires gun (Pictur...