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The U-boat War in World War Two (Kriegsmarine, 1939-1945) and World War One (Kaiserliche Marine, 1914-1918) and the Allied efforts to counter the threat. Over 40.000 pages on the officers, the boats, technology and the Allied efforts to counter the U-boat threat.
U-boat Deck guns - Technical pages - German U-boats of WWII - Kriegsmarine
Steel predators: The silent threat of German U-boats in WWI - History Skills
Captured U-boats and their Fate - HubPages
German submarine U-534 - Wikipedia
218 Uboat Stock Photos - Free & Royalty-Free Stock Photos from Dreamstime
Ask Rufus: The U-boat war along the Gulf Coast - The Dispatch
Submarines in World War II (U.S. National Park Service)
That Time a Navy Destroyer Landed Atop a German Sub in WWII
German U-boats from WWI and WWII seem to look the same and be used the same. What important advances in submarine technology and tactics happened between the two world wars? - Quora
PAPERMAU: WW2`s German U-Boat Type VII C Submarine - by U-Don Factory
Phantom of the Deep: Germany's Underwater Wonder Weapon
Deck Guns on German U-boats – More USEFUL then you think… ('39-'43)
The U-Boats of World War Two - Weapons and Warfare
