So, was in the lift at work, and it’s one that when door close its completely sealed from light.
In emergency I would assume would be some form of lighting.
However, for those stuck, at some point when the panic sets in and a million calls and text are made, what happens when phone dies.
My thought, is have corner/corners with a independently powered wireless charger in the floor.
If there a while, at least those with wireless charging phones can keep them charged.