The same way people do all the time. It doesn't fill every last space with rubble; there's going to be spots where there's areas that are not filled in due to how the place collapsed.
Done in by the dubious doings of destiny.
You can have enough air trapped in there for a while, and since the rescue operations began immediately with a lot of people (presumably) there that also have some kind of life-detection system (presumably) you would probably be alright even if air didn't get in through the cracks.
But yes.
Done in by the dubious doings of destiny.
I suppose the real question then is how advanced the medicine is. Can broken limbs be healed in a few days? Seems a bit too miraculous for Gary to get out unscathed.
Beneath the gold, the Bitter Steel.