Absolutely, and even more curious is how did they see to do it in the dark? There is absolutely no soot from torches or oil lamps on the ceiling.
Using polished metal mirrors has been shown to work well enough at surprising depths. Also, the oils (olive oil, seed oils) used in ancient oil lamps were also very low producers of soot. Kerosene is a modern discovery, if memory serves was discovered in Poland (the discoverer had what turned out to be oil seeping out on his property, and his neighbors urged him to try to make vodka out of it; that could easily be a mythical detail).
http://oliveoilsource.com/asktheexpert/how-did-ancients-use-olive-oil-their-lamps
https://www.antiquelampsupply.com/type-of-oil-used-in-oil-lamps
Never, ever, clean up your workstation?