No more manned Submarines

Robotic submarines are soon to replace manned submarines, just like the autonomous planes are replacing pilots. These robotic subs are far cheaper than the huge manned subs of todays navy, and because they are cheaper, the navy can produce more of them. The are many befits to this, but the main reason being that 40 robot subs can be sent to battle and even if 20 get destroyed and detected, there is still another 20 robot subs that can complete the mission.