Indeed, no chance of surviving if someone blows the Halon bottles.
Imagine that moment when all his colleagues got back to their crews room or whatever and realised......
At large international airports these days it isn't always the case that you work as a 'team', various individuals will be chopping and changing between flights as and where they're needed so it's entirely possibly the poor lad could've gone all the way to Angola without anyone batting an eye lid
It's actually more common than you think for loaders to get locked in the hold, I've known it happen 3 times but thankfully they all managed to raise the alarm as they taxied out