H-047-1: Operation Teardrop
Battle of the Atlantic Volume 4 Technical Intelligence From Allied Communications Intelligence
U-Boat rumoured to have helped Nazis escape to Argentina is discovered | The Independent | The Independent
Op-Ed: LUSV as an Anti-Air and Anti-Ship Missiles Platform - Naval News
U-Boats off the Outer Banks | NCpedia
U-571, World War II German Submarine
The Flower-Class Corvette — Nine Facts About the Tiny Warship That Played a Huge Role in WW2 - MilitaryHistoryNow.com
The Nazis Ordered Their U-Boats to Fight Airplanes. It Was a Massive Mistake. | The National Interest
Forgotten Fights: USS Buckley Duels U-66 | The National WWII Museum | New Orleans
German submarine U-530 - Wikipedia
Submarine in a lake? Exploring the USS Cobia and the Wisconsin Maritime Museum - CNET
Archaeology news: Treasure hunter claimed to have found Nazi U-boat packed with gold | History | News | Express.co.uk
The history of submarine warfare off the Jersey coast - WHYY
The history of submarine warfare off the Jersey coast - WHYY
German submarine U-977 - Wikipedia
World War II's Most Daring U-boat Attack - Warfare History Network
Archaeology news: Treasure hunter claimed to have found Nazi U-boat packed with gold | History | News | Express.co.uk
Submarine | Definition, History, Types, Characteristics, & Facts | Britannica
