Barbara Demick and John M. Glionna
LA Times 
July 24, 2010
Some in South Korea dispute the official version of events: that a North Korean torpedo ripped apart the Cheonan.
The way U.S. officials see it, there’s little mystery behind the most notorious shipwreck in recent Korean history.
Secretary of State Hillary Rodham Clinton calls the evidence “overwhelming” that the Cheonan, a South Korean warship that sank in March, was hit by a North Korean torpedo. Vice President Joe Biden has cited the South Korean-led panel investigating the sinking as a model of transparency.
But challenges to the official version of events are coming from an unlikely place: within South Korea.