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
Mackerel-class submarine
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The Mackerel-class submarines were a pair of experimental prototype submarines built just prior to World War II and launched in 1940 and 1941. The two submarines were similar in size and capability to
USS Mackerel (SS-204)