Type XVII submarine - Wikipedia
U-boat - Wikipedia
H I Sutton - Covert Shores
German submarine V-80 - Wikipedia
H I Sutton - Covert Shores
Why Germany's New Super Stealth Submarines Could Take on Any Navy | The National Interest
The V80 Research Submarine - Naval Discussion - Sturgeon's House
U-Boats | Axis Power 7 Central Wiki | Fandom
Battle of the Atlantic - The End for the U-Boats
Phantom of the Deep: Germany's Underwater Wonder Weapon
Germany's Super Sub, the Type XXI U-Boat | Sails and Salvos - YouTube
The Peroxide Subs: Fire and Water Don't Mix - YouTube
Submarine Photo Index
Elektroboot submarines (1935 – 1955) | Robert Whiston's Weblog
H I Sutton - Covert Shores
Submarine Photo Index
Did the design and propulsion of the German Navy's Type XXI U Boat influence post World War Two submarine design? - Quora
Elektroboot submarines (1935 – 1955) | Robert Whiston's Weblog
World War II in Pictures: Type XXI U-Boat, Forerunner of Modern Submarines
Type XXI Elektroboote: Mother of Modern Submarines | Defensionem
Type XXI Elektroboote: Mother of Modern Submarines | Defensionem
Elektroboot submarines (1935 – 1955) | Robert Whiston's Weblog
Submarine - Wikipedia
Revell 1/144 Type XXI U-boat, by Tom Cleaver
H I Sutton - Covert Shores
