’Yugo’ type midget sub
Speed : 10kts surfaced, 4 kts submerged
Armament: 2 x533-mm externally-mounted torpedoes in drop gear in some variants, possibly torpedo tubes in some and none in infiltration variants.
The Yugo class is so named because it was built to plans supplied by Yugoslavia in 1965. North Korea had started an indigenous midget-submarine programme prior to that but had been somewhat unsuccessful, with a crude submarine being captured by the South in 1965 after its crew abandoned it when it was beached on a mudflat during a receding tide on the Han River: