Yugo class submarine
Encyclopedia
The Yugo class submarine is a class of four midget submarine
Midget submarine
A midget submarine is any submarine under 150 tons, typically operated by a crew of one or two but sometimes up to 6 or 8, with little or no on-board living accommodation...

s used primarily for infiltration and espionage by North Korea
North Korea
The Democratic People’s Republic of Korea , , is a country in East Asia, occupying the northern half of the Korean Peninsula. Its capital and largest city is Pyongyang. The Korean Demilitarized Zone serves as the buffer zone between North Korea and South Korea...

. The class is so named because it was built to plans supplied to North Korea by Yugoslavia
Yugoslavia
Yugoslavia refers to three political entities that existed successively on the western part of the Balkans during most of the 20th century....

 in 1965. This class is actually a family of midget submarines for that not all are identical. The displacement is either the standard 90 tons of the original Yugoslavian design for the early units, or 110 tons for the later units, while armament is either a pair of 400 mm torpedo tubes (early units) or a pair of 21 in short torpedo tubes (later units); however, all units have the same range: 550 nautical miles (1,018.6 km) at 10 knots (19.6 km/h) on the surface and 50 nautical miles (92.6 km) at 4 knots (7.8 km/h) submerged. Their final example was built in the 1980s, after which they were superseded by the Sang-O class submersibles. In 1998 one out of the 6 submarines was captured by the South Koreans. In July 2007, 4 were given to Iran
Iran
Iran , officially the Islamic Republic of Iran , is a country in Southern and Western Asia. The name "Iran" has been in use natively since the Sassanian era and came into use internationally in 1935, before which the country was known to the Western world as Persia...

to repay some of North Korea's debts to Iran, the last one was retired but kept by the North Koreans.
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