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North Korea rebuffs South Korea's evidence on Cheonan attack

South Korean defense officials presented evidence Thursday that a North Korean submarine torpedoed the Cheonan, a South Korean Navy ship, in March, killing 46 sailors.

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A Chinese Foreign Ministry spokesman in Beijing hinted at China’s lukewarm position when he urged all sides to “remain calm” and not risk an escalation of tensions. A Chinese official called the episode “unfortunate.”

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Further threats

The South Korean military co-leader of the investigation acknowledged the remaining threat posed by North Korea’s 70 submarines, many of them based in ports on the Yellow Sea above the Northern Limit Line, below which the South bars North Korean ships. North Korea has long disputed the line, and it was in those disputed waters, off an island held by the South since the Korean War, that the ship was blown up.

“Defensive measures are very difficult and limited,” Lt. Gen. Park Jung-e said at the briefing. “The most effective way to destroy the submarine is to destroy it when it is identified at the base. Once the submarine leaves the base, it is very difficult to detect.”

Park said the submarine that fired the torpedo at the Cheonan was “confirmed” to have “left the base,” but “we were not able to expect that a submarine, once seaborne, was going to infiltrate our waters.”

To fend off future attacks, he said, “our plan is to reinforce submarine measures by establishing a submarine detection system in areas that are vulnerable.”

‘No other plausible explanation’

He and the co-leader of the investigation, Yoon Duck-yong, a retired professor at the Korea Advanced Institute of Science and Technology, offered a raft of detail on the attack.

The submarine that launched the torpedo belonged to the Yeono class, 130 tons, a tiny submersible that is basically “an underwater weapon system,” said the report. North Korea has 10 of these “midget submarines” that are capable of entering South Korea’s coastal waters undetected, in addition to 20 1,800-ton Romeo class submarines and 40 300-ton Sango submarines.

A South Korean dredging vessel pulled up the pieces of the torpedo just five days ago, after a meticulous search over a 500-square-yard area. That discovery, defense officials say, sealed their case against North Korea.

The investigation report described how “a strong underwater explosion generated by the detonation” of the torpedo below the gas turbine room of the vessel sent off a “a shock wave and bubble effect.” All of the sailors who died were killed by the shockwave, it said, while 58 sailors on the larger portion of the vessel were able to escape.

“The evidence points overwhelmingly to the conclusion that the torpedo was fired by a North Korean submarine,” the report concluded. “There is no other plausible explanation.”

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