Talked to some local cave explorers once (Czech Republic has huge karst cave systems) and they mentioned they often hang from a rope on wet cave walls with powe

Talked to some local cave explorers once (Czech Republic has huge karst cave systems) and they mentioned they often hang from a rope on wet cave walls with power tools and rubber boots when making new parts of caves accessible, so they can press further to new parts. A floating lightning drone could be useful for that. :) You could combine this with inflatable light technology & the gas bag itself could be a source of illumination.