Found 1 comment on HN
brownbat · 2017-03-08 · Original thread
It looks like the archway is filled with holes for candles. Lighting for meetings could not have been as trivial a task as it was for the researchers, who seem to have been able to toss down some cheap super bright LEDs(?).

An hour of good lighting in a subterranean cave in those days must have cost a fortune. (Per Jane Brox, anyway...)

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