I have nothing but admiration for cavers.I cannot stand enclosed spaces or being unable to easily get out - "Don't fence Me In!" or tie me down for that matter.
I have a pair of neato flashlights, one in car and one in bedroom night table. It has a sorta handle thingie that fits flat when not being used to wind up the LED light. Works great and no batteries .. which are pollutants if not disposed of properly. I've seen the shake-it-up flashlight advertised on TV. Glad to hear it really does work in real life.