go to the U-boat screen by pressing near the chair in the room.
Then chose the various sections, which will show you what's available at the time.
You will get a full load of torpedoes automatically, If you want more electric T-2s you have to select them one by one.
Early on there aren'r many upgrades, but the one you do need is improved hydrophones. Get that right away.
You may also want to visit my webbie for tactics and other good info.
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