Can anyone seriously look at those photos of a Hilux ute, where a cylinder rupture in the rear load area, only contained by a fibreglass canopy, has utterly demolished the cabin area as well, and still feel a need to explain what direction the Qantas cylinder was facing, etc, when it failed?
The cylinder failed.
Some of it, including the valve, went upwards and was found in and around the door in the passenger cabin.
The escaping gas (not a rocketing near intact cylinder) blew a hole in the aircraft fuselage.
There was no fire. The oxygen was all gone, dissipated in a fraction of a second, long before any fire had a chance to get started.
Have another look. Gas, not cylinder fragments, did the damage.
Mechanical engineer.
No aircraft industry experience, but a healthy respect for compressed gases.