These are the values of the Oxygen and Negative Ion concentrations measured in Underground Labyrinth Ravne in Visoko on October 1, 2018:
– Outside, in front of the Ravne tunnels: Oxygen 20,7%, negative ions 700 ccm
– Eggshaped block: Oxygen 20,2%, negative ions 34.000 ccm
Healing Chamber: Oxygen 20,0%, negative ions 53.000 ccm
– Mega-Ceramic block K 2: Oxygen 19,9%, negative ions 32,000 ccm