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The Schnorchel - Technical pages - German U-boats of WWII ...
U-Boat Tactics: Surfaced Torpedo Attacks - uboataces.com
U-boat Deck guns - Technical pages - German U-boats of WWII ...
U-boat | German Submarine Warfare in WWI & WWII | Britannica
Sunken Nazi U-boat discovered: why archaeologists like me …
Type VII submarine - Wikipedia
U-boat - Wikipedia
How German U‑Boats Were Used in WWI—And Perfected in WWII
Steel predators: The silent threat of German U-boats in WWI
The Wargame That Revealed a Nazi U-Boat Tactic | TIME