Since an international panel concluded that a North Korean torpedo sank a South Korean naval vessel in March,
some people, including naval experts, have contested the finding.
They suggest a government cover-up of a simple accident.
Under pressure to answer to its critics, the South Korean government is expected to release the full 250-page report of the investigation into the sinking of the Cheonan.
Al Jazeera's Steve Chao reports.
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