Sub officer recalls striking 1-man fishing boat with periscope

Unrestricted Submarine Warfare, 1917 – 1918

NATO's biggest drills since Cold War send signal to Russia

Undersea Warfare Magazine by Undersea Warfare Magazine - Issuu

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Perilous Rescue of the SS Cape San Juan - Warfare History Network

USS Seawolf at the Battle of Christmas Island - Warfare History

Russian submarine collided with Royal Navy warship in North

U BOATS NAZI GERMANY WORLD WARTIME SUBMARINES U BOOT UNTERSEEBOOT

Trident submariners conduct strategic deterrence missions > Air