I just watched a one hour special on this discovery. It also shows the lead archaeologist enetering the cave...he lost 50 pounds so that he could do so and still almost got stuck. He also found ‘writing’ on the walls. On Netflix.
I’ve never been much on spelunking myself, but if I could lose 50 pounds (one half of my current personal project), I don’t think I’d squeeze into a cave. Seems like a remote control robot critter would be my best friend at that point. :^)