: A revolutionary late-war design optimized for staying submerged almost indefinitely.

: The largest variant in the game, equipped with specialized fast-running engines for transit, though its size makes it a large target for Allied aircraft. The "Electroboat" Revolution: Type XXI

For veterans who find the Type VII’s range constricting, the opens the world. However, Silent Hunter 3 all submarines includes this boat with a major caveat: dive time.

In any other submarine, you spend 90% of your time on the surface. With the Type XXI, you . You can outrun a Flower-class corvette underwater. You can reload torpedoes faster (automatic hydraulic system). You can dive to 200m and stay there for days.

: Primarily short-range coastal defense and training [12, 15].

The base game includes Types II, VII, IX, and XXI. The XVIII and XXIII are often added via the popular Grey Wolves Expansion (GWX) or other mods.