SM U-35 (Germany)
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SM U-35 was a German U 31-class U-boat which operated in the Mediterranean Sea during World War I. It ended up being the most successful U-boat participating in the war, sinking 220 merchant ships for a total of 505,121 gross register tons (GRT).
SM U 35, Commander Lothar von Arnauld de la Perière, cruising in the Mediterranean
The German submarine SM U-35 next to the merchant ship Roma, also German, in the port of Cartagena. The visit of the submersible on June 21, 1916, endangered Spanish neutrality in the Great War.
SM U-35 on the surface in the Mediterranean
Deck gun
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A deck gun is a type of naval artillery mounted on the deck of a submarine. Most submarine deck guns were open, with or without a shield; however, a few larger submarines placed these guns in a turret.
British Mk XXII 4-inch deck gun from S-class submarine
5"/25 caliber gun on the deck of Balao-class submarine USS Bowfin
Bofors 102 mm/4-inch naval gun from the Romanian submarine Delfinul