Back in the '80s we did try illuminating a Cwmorthin chamber with an army flare..... but the smoke was something else, especially after it was kicked to the bottom of the chamber....
Before:
🔗Cwmorthin-Slate-Mine-Archive-Album-Image-37164[linkphoto]Cwmorthin-Slate-Mine-Archive-Album-Image-37164[/linkphoto][/link]
On the way down...
🔗Cwmorthin-Slate-Mine-Archive-Album-Image-039[linkphoto]Cwmorthin-Slate-Mine-Archive-Album-Image-039[/linkphoto][/link]
After...
🔗Cwmorthin-Slate-Mine-Archive-Album-Image-37163[linkphoto]Cwmorthin-Slate-Mine-Archive-Album-Image-37163[/linkphoto][/link]
No more photos were taken after this - we couldn't see our hands, feet, or anything.
Not reccomended, as my statistics lecturer used to remark about Russian Roulette....
I suspect the lanterns may not be entirely smokeless either - and probably not as bright ?
Grahami
The map is the territory - especially in chain scale.