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en.wikipedia.org/wiki/ROKS_Cheonan

ROKS Cheonan (PCC-772) was a Pohang-class corvette of the Republic of Korea Navy .... The CHT-02D torpedo manufactured by North Korea utilizes acoustic/wake homing and passive acoustic tracking methods. However, an expert at a ...

en.wikipedia.org/wiki/ROKS_Cheonan_sinking

The ROKS Cheonan sinking occurred on 26 March 2010, when Cheonan, a Pohang-class ..... The CHT-02D torpedo manufactured by North Korea utilizes acoustic/wake homing and passive acoustic tracking methods. Simulations indicated that ...

www.naval-technology.com/features/feature90570

Jul 26, 2010 ... With the fortuitous subsequent discovery of components of a North Korean-made CHT-02D torpedo, bearing markings in the Hangul script used ...