Film crew use gas detector

A BBC film crew filming sulphur miners in the crater of an active volcano used a Crowcon Tetra 3 portable gas detector to warn of dangerous levels of hydrogen sulphide (H2S). The crew were filming in Indonesia as part of the BBC's landmark Human Planet series.

During filming the crew was engulfed in a cloud of H2S gas and had to quickly don gas masks. They measured the gas concentration with the Tetra 3, which immediately went into alarm mode, showing a concentration of 194 ppm - almost 40 times the safe breathing level.