oxygen bottle cause likelihood
If a high pressure oxygen leak started, a 100% oxygen atmosphere would start a fire with the slightest oil based contaminant or even heat from friction. A blow torch fire would result until the oxy ran out, not a bang. No sign of fire here, so I don't think that happened. An explosion of the bottle is very unlikely also, it is an aircraft quality component that would be regularly inspected/replaced, and I've never heard of a cylinder failing like that? I don't like the look of the way that rivet line has fully seperated from the stringer in the picture. Does anyone know if a cylinder is missing here, or is the cylinder shown in the picture the only one in this area?