Raiders of the Deep: U-boats of the Great War, 1914-18

Command a World War I U-Boat. How much tonnage can you sink, can you survive the war?

Steam Workshop::The Hunters: German U-Boats at War, 1939-43

Compass

U-boat, German Submarine Warfare in WWI & WWII

Raiders Of The Deep: U-boats Of The Great War, 1914-18

Olt.z.S Paul Wagenführ and U44

Silent War 2.0 by Compass Games — Kickstarter

Module:Raiders of the Deep: U-boats of the Great War, 1914-18 - Vassal

Steam Workshop::The Hunters: German U-Boats at War, 1939-43

German WW1 U-Boat Campaign That Almost Broke UK

Raiders of the Deep U-boats of the Great War 1914-18 in Vassal - Content & Gameplay - WW1 Subs