Originally Posted by
enola-gay
IF, and I say IF, this turns out to be an event managed from within the flight deck secure door and it ran its full course to the Southern Ocean without passenger incapacitation, then it must have been utter and unimaginable bedlam in the cabin for 7 hours.
It is hardly conceivable the door would be able to resist desperate and unhindered attempts of the Pax/CC to open it forcefully for 7 hours.
Crash axe and/or stuff from the galley or the cabin itself in the hands of multiple desperate People fighting for their lives would surely finally take its toll on the door and/or the floor.
It is therefore rather likely that at least in the latter phases of the flight no one in the cabin was conscious. Potentially in front of the door no one either.
What caused this is the big mystery for which we can only hope the CVR/FDR to be found and readable.