premise: The death toll from a colliery blast in north China last week has risen to 41 with six others still missing, local government sources said on Wednesday.
  Rescuers found another body Wednesday morning in the Jiaojiazhai Colliery in Xinzhou, a city in the central northern area of Shanxi Province, according to a provincial coal mine work safety conference held on Wednesday.
  A gas explosion occurred at 11:45 a.m. on Nov. 5. at the Jiaojiazhai Colliery, when 393 miners were working in the pit. Three hundred and forty-six escaped after the blast.
  Search and rescue efforts are continuing though rescuers believe the six missing miners have little chance of survival, given the high density of toxic gas and serious cave-ins following the blast.
   What is the result from the blast in the cave?
hypothesis: high density of toxic gas and serious cave-ins