Analox Limited 15 Ellerbeck Court, Stokesley Business Park, North Yorkshire, TS9 5PT, UK T: +44 (0)1642 711400 F: +44 (0)1642 713900 W: www.analox.net E: info@analox.net Case Study Quantitative measurement of ambient oxygen & carbon dioxide levels in Tunnel Ravne, Visoko, Bosnia and Herzegovina by Paul Smith, Technical Writer, Analox Analox Aspida CO2/O2 monitor on the Bosnian Pyramid of the Sun, Visoko Quantitative measurement of ambient oxygen & carbon dioxide levels in Tunnel Ravne, Visoko, Bosnia and Herzegovina Author: Paul Smith June 2015 Page 2 of 4 Introduction Tunnel Ravne is a network of underground passages and chambers built in ancient times by an unknown prehistoric culture. At some point in history it was deliberately blocked up with dry stone walls backed

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