High Quality Content by WIKIPEDIA articles! The Yono class submarine is a class of North Korean miniature submarines, produced for domestic use and export. Also referred to as Yeono class vessels, these submarines displace 130 tons, significantly less than North Korea's larger 1,800-ton Romeo class submarines. As of May 2010, North Korea is reported to operate 10 of these submarines. A Yono class submarine is thought to have fired the torpedo attack which sank a South Korean Pohang-class corvette, the ROKS Cheonan on March 26, 2010 in South Korean waters. According to investigators, the weapon used in the attack was a North Korean manufactured CHT-02D torpedo, of which substantial parts were recovered. The device exploded not by contact, but by proximity, creating a powerful pillar of water, called the "bubble jet effect".

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