What Is the Point of Submarine Warfare?

Jocg roshan sing asks how a country can recognize its adversary and counter attack if the nuclear tipped ballastic missile gets fired from the ocean for the sea, using a submarine. There is a whole version of warfare happening right now - we are not aware of submarine warfare. It is a cat and mouse game that's happening as we speak. Right now, there are fleets of submarines in the pacific ocean, in the atlantic Ocean, in the antarctic ocean,. In the northern ocean, arctic ocean,  in the indian ocean...