2 × 17.7 inch external-traversing in front of conning tower (1x2)
The K V class was a class of three submarines, built by Fijenoord shipyard in Rotterdam for the Royal Netherlands Navy. Used for patrols in the Dutch colonial waters. The submarines diving depth was 40 metres (130 ft). Only K VII was still in service at the start of World War II. She was bombed by the Japanese in the harbour of Soerabaja.