Brother Francis noticed that the debris which had been lying in the antechamber for centuries was darker in color and rougher in texture than the debris which had weathered under the desert sun and in the sandy wind before today’s cave-in. One could tell by a glance at the stones that Inner Hatch had been blocked not by today’s rockslide but by one more ancient than the abbey itself. If Fallout Shelter’s Sealed Environment contained a Fallout, the demon had obviously not opened Inner Hatch since the time of the Flame Deluge, before the Simplification. And; if it had been sealed beyond the metal door for so many centuries, there was small reason, Francis told himself, to fear that it might come bursting through the hatch before Holy Saturday.