[Hartmann]

The most important thing in a u-boat simulator, the sense of a real war out there, real radio reports of other submarines and planes, comunication with BDU and wolfpacks ,IA submarines capable of dive, fire torpedoes and evade scorts.

Bilge gauge, with the water level, this could raise during silent running at some deep, the only way to avoid this, switch on the pumps or use a true limited compressed air. ( command aces of the deep )

Realistic fog and not only with heavy rain, moon and real calendar