Raiders of the Deep: U-boats of the Great War, 1914-18 is a new game inspired by Gregory Smith's The Hunters: German U-Boats at War, 1939-43 that places the player in command of a German U-boat during WWI. Raiders of the Deep: U-boats of the Great War, 1914-18 is a new game inspired by Gregory Smith's The Hunters: German U-Boats at War, 1939-43 that places the.