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 US Sailors Saved U-Boat, Enigma, Codebooks in Daring High-Sea Raid
Submarines: from U-boat to Dreadnought - Global Defence Technology, Issue 105
The Surrender of U-858 - Delaware Beach Life
The Modelling News: Preview: Two new crews for your 1/35th scale U-Boat surface from Border Model
Nazi U-Boats Terrorized Seas During World War II
Munizionamento Cannone Sommergibili Regia Marina - Tecnica - Betasom - XI Gruppo Sommergibili Atlantici
The Modelling News: Preview: Border Model's new 1/35th scale DKM Type VII-C U-boat conning tower & deck
Phantom of the Deep: Germany's Underwater Wonder Weapon
U.S. Ship Sunk in World War II by German Sub Is Found Off Maine Coast - The New York Times
Why were the guns on submarines still usable after being underwater? Wouldn't the guns rust or jam being exposed to sea water? - Quora
submarines World War II -- technology naval campaigns ship types
Exclusive: Wreck of fabled WWI German U-boat found off Virginia
Munizionamento Cannone Sommergibili Regia Marina - Tecnica - Betasom - XI Gruppo Sommergibili Atlantici
U-Boat deck gun, the research continues! – The Searchers