Hello,
Any weeks ago, Google suggested me a documentary on Youtube about a historic site which keeps again many secrets.
Please be careful, the movie duration in over two hours! I have no time for this type of duration, so I listened to the audio during a daily task, and watched several extracts only.
I found this movie interesting, and I share its link :
[One of*] the most enigmatic caves of the ancient world.
(*) : Sorry, the title is a little bit "Put a click" ! But I insure you the questions that the persons are asking stay careful, seems well respect the rules of the science, excepted about what it seems, for me, to be a coincidence the "near-one-meter-measure". But for the rest, it seems to be lots of advanced technics.
I did not find an english wikipedia description, only a french article. Here