There was a documentary on the caves a few years ago. Those suits are cooling suits because it is around 120F with 100% humidity, and low/no oxygen as I recall.
Funny how crystal quartz has been necessary to mankind for millennia.
The heat is so intense in the caves where the crystals are located, that even with the protective suits on, scientists can only stay in the cave for minutes at a time.
The documentary you mentioned was very interesting. These gigantic crystals are unique.
Can you imagine the first human who found these huge crystals? Unbelievable.