CJG wrote:
comments) but to be stuck on a tunnel deep underground in the dark. Im

They won't have been in the dark at all. Plenty of emergency lighting in the
trains and on platforms, every third tube or so. It just goes a bit dim.

It is amazing how little light the human eye actually needs to see. Just one
solitary 60w light bulb per carriage and I bet you'd still see well enough
to wander around.