The government Monday reaffirmed that it was sunk in a North Korean torpedo attack in the final report on a multinational investigation into the March sinking of a warship.
The 1,200-ton patrol ship Cheonan sank near the tense inter-Korean border on the night of March 26, killing 46 sailors aboard. The other 58 were rescued.
A Seoul-led multinational team of investigators concluded in May that the vessel was sunk from the underwater explosion of a torpedo fired by a midget North Korean submarine that sneaked into South Korean waters.
Investigators presented as evidence the propulsion device of the torpedo retrieved from the site of the sinking, marked with "No. 1" written in North Korean-style characters.
The team also said the recovered torpedo parts point to a model shown in North Korea's pamphlet of its weapons.
The full report contained some more details, including those on the explosion, to explain how the 73 investigators from South Korea, the United States, Britain, Australia and Sweden reached their outcome.
"The detonation location was 3 meters to the port from the center of the gas turbine room and at a depth of 6 to 9 meters," it said. "The weapon system used was a CHT-02D torpedo with approximately 250 kilograms of explosives manufactured by North Korea."
The book-length document also included communication records between the Cheonan's surviving captain, Cdr. Choi Won-il, and his immediate boss, Squadron Commander Capt. Lee Won-bo, at the time of the sinking.
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