How deep can submarine dive in to the water?

it depends if the water is really deep or not and how good in shape the submarine is

Ans 2 - The operational depth of submarines is secret -(or 'classified' as navies say it) However it's generally accepted that most modern submarines can dive to around 1,500 feet and possibly even more in the case of the very latest. Submarines evolve and improve continually as no country wants anothers warships to be better.