They were still underwater when the roof caved in. Still buffeted by the impact of the shock waves travelling through the liquid even though the debris was slowed in its descent. Still trapped in a pocket beneath a great slab of twisted metal and concrete as the water began to slowly filter away through the fractures and cracks created by the explosion. Still racked by layer upon layer of sensation, heat and pressure and flame and cold and darkness and chlorine and bile and blood all clamoring for attention from brains paralyzed by fear and desperate for oxygen.
Still drowning.