By A Mystery Man Writer
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.
How fast can a German U-boat go? - Quora
German Submarines in WW1 (Underseeboote, 1905-1918)
German Submarine Activities on the Atlantic Coast
U-boat, Military Wiki
Deck gun - Wikipedia
Submarines at War: From the Turtle to U-boats, nuclear submarines
Captured U-boats and their Fate - HubPages
Munizionamento Cannone Sommergibili Regia Marina - Tecnica - Betasom - XI Gruppo Sommergibili Atlantici
HobbyBoss 83504 WWII German Type VIIB U-Boat 1/350 Scale Plastic
Munizionamento Cannone Sommergibili Regia Marina - Tecnica - Betasom - XI Gruppo Sommergibili Atlantici
Regia Marina - Betasom - XI Gruppo Sommergibili Atlantici