[Powerthighs]

1. It means things like reloading torpedoes faster, fixing damage faster, spotting contacts better, doing speed estimation in manual targeting more accurately, etc. They don't tell you the exact formulae they use, it's hidden inside the game, but obviously a higher green bar is better.

2. You can turn off torpedo loading, or it gets turned off for you when you go to silent running. There is a torpedo button under one of the menus (I think its the first one, the one with the wheel). This button must be activated for your crew to load torpedoes.

3. As maerean_m indicated, if you click under the depth wheel, it will go to a version that goes a lot deeper. On this version, the red line is your test depth.

4. If, while diving you pass a thermal layer, a crew member will tell you. They are often between 200 and 300 feet. They don't always exist, especially in shallow water.

5. Subhunter ships often have very shallow drafts. Set your torpedoes for their shallowest depth, and they may pass underneath anyway. Especially early in the war when torpedoes ran deeper than they were supposed to. The PK is the Position Keeper. If you are using manual targeting you can turn it on and it will "track" a target by evolving the firing solution over time based on a set of intial inputs.

6. Not sure. Make sure you turn off battle stations when done fighting so your crew doesn't get exhausted.

7. Any time you want your crew to perform more efficiently. I usually go to battle stations when an enemy enters visual range. When at battle stations, your crew will perform duties more quickely and more accurately. However, no one sleeps at battle stations so monitor crew fatigue and don't leave them on too long.

To open the torpedo tube door, select the tube and press 'Q'. Pressing 'Q' again will close it.