Since an international panel concluded that a North Korean torpedo sank a South Korean naval vessel in March,br br some people, including naval experts, have contested the finding.br br They suggest a government cover-up of a simple accident. br br 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. br br Al Jazeera's Steve Chao reports.