Questions about the game. (Battlestations: Pacific)

How can you launch torpedoes into the depths?

this means that torpedoes normally rise to the surface of the water, but if you choose an underwater target, the torpedo will go under water

How to start a game on Windows 8.1 the
game starts up to the loading screen and everything, whether it's a pirate or a license, the
game does not work

help me please!