I found today in steam the game Crush Depth: U-Boat Simulator (
https://store.steampowered.com/app/1...oat_Simulator/) and it looks a little bit like Wolfpack.
The description of it on Steam is: Crush Depth is a first-person type VII U-boat simulator. Experience operating and maintaining the U-boat’s complex systems, engaging enemy shipping, celestial navigation, survival mechanics, as well as the lighter side of life on the boat.
The official website of it is:
https://www.crushdepth.com