One crewman did die.
One crewman had his girlfriend down there as well.
I am interested to know WHO the one person is that the recovery team has NOT found. That's an immediate focus of the investigation from an arson point of view. Unlikely but that must be considered.
If the electrical system wiring in the bunk area got hot and 'flash flamed' in the bunk area, that would explain it.
Does "noise jolted" = explosion? Then a faulty tank or valve is to be looked at.