Investigation On The Sinking Of The South Korean Warship Cheonan Continues

The stern of the South Korean Cheonan ship is docked on a barge off Baengnyeongdo island near the maritime border with North Korea, northwest of Seoul, Friday. Lee Jung-Hoon/Yonhap/Reuters

Clues Suggest NKorean Sub Behind Warship Attack -- New York Times/AP

TOKYO (AP) -- Experts say North Korea's submarine fleet is technologically backward, prone to sinking or running aground, and all but useless outside its own coastal waters.

And yet many are asking: Could it have been responsible for the explosion that sank a South Korean warship in March? And if so, how could a sub have slipped through the defenses of South Korea, which, with significant American backing, maintains a fleet far more sophisticated than its northern neighbor's?

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More News On The Sinking Of The South Korean Vessel Cheonan

S.Korea: high explosive traces on ship wreckage -- AFP
Traces of Explosive Found on Sunken S. Korean Ship -- New York Times
S. Korea confirms detection of explosive chemical in sunken warship -- Xinhuanet
South Korea finds remains of explosive where Cheonan sank -- Voice of Russia
U.S. Lawmakers Mull Putting N.Korea Back on Terror List -- Chosun Ilbo
S.Korea to Resume Psychological Warfare Against North -- Chosun Ilbo
China's troubling friendship with N. Korea -- Fred Hiatt, Washington Post