[SunkenCiv]

Probably the creepiness comes from experiencing the grotto itself. One has to wonder how many human remains are down there, and if there are some, how old they are. Seems like a worthwhile idea to bore a parallel shaft and install an elevator (and/or staircase), and probably an underground facility for the analysis and cataloguing of the finds.

[TigersEye]

I would think they could set up an electric winch above the entrance and save a lot of muscle power getting people and equipment in and out. Just on a temporary per-exploration basis.

I found a pic of a placard there that says it may have existed (and been trapping animals) for 250k years. Wow!