In the first part of this series, ‘Air monitoring in the Bosnian Valley of the Pyramids—Part 1’, I recounted my trip to Visoko in March 2015. Bosnia and Herzegovina is a fascinating country and well worth going to—not only to experience Tunnel Ravne and the nearby Pyramids but also to see the fabulous landscape and enjoy the culture and hospitality of its people. Thousands of tourists arrive each year from across the world and many of them visit again.
Exploration of the underground labyrinth at Ravne continues and good progress is being made in clearing the prehistoric tunnels. In recent weeks a new open section was discovered, containing artificially constructed walls, indicating that the tunnels were deliberately blocked up in the ancient past.
During tunnel exploration the on-site geologist, Mejra Kozlo, checks the air quality using an Analox Aspida dual-sensor gas detector. This continuously analyses the amount of oxygen (O2) and carbon dioxide (CO2) in the air, thus improving the safety of staff, volunteers, researchers and tourists. Since my return from Visoko on the Spring Equinox Tour I have produced a Case Study based on the O2 and CO2 measurements I took at Ravne. You can read it here:
Author: Paul Smith, Technical Writer.