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U-boat - Wikipedia
Type VII submarine - Wikipedia
U-boat | German Submarine Warfare in WWI & WWII | Britannica
German Navy U-Boat (Submarine) Headquarters War Logs
How America captured a German submarine right before D-Day
The Mystery of U-853 – All U-Boats Had Orders to Surrender; …
1945: May 14: Surrender of German U-boat, U-858 - NHHC
How German U‑Boats Were Used in WWI—And Perfected in WWII - HISTORY
U-boat summary | Britannica
U-boat Types - German U-boats of WWII - Kriegsmarine - uboat…