The 8.8 cm SK C/35 was a German naval gun used in World War II.
A gun aboard U-251 in 1942
The typically unshielded SK C/35 deck gun of a type VII U-boat is visible below the torpedo tail.
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