At the time of the sinking of the Republic of Korea Navy’s Pohang Class corvette Cheonan (PCC-772) on March 26, 2010 there was much discussion of the loss being caused by a “human torpedo” or “a suicide-bomber riding a torpedo to its target.” While such headlines were dramatic, an international commission of inquiry subsequently concluded that the vessel was sunk by a CHT-02D torpedo manufactured by the Democratic People’s Republic of Korea. This attack is believed to have been conducted by a Yeono Classmidget submarine (SSm) from the Reconnaissance General Bureau. But the incident raised interest into the North’s