Hello Jim; Too many miners are dying because of false safety reports by the Fireboss. It is his duty to check out unsafe conditions before the shift starts. Some cos use their production foremen as firebosses.This is unlawful. Also many miners die because they wont test roof conditions, This is done by punching a metal rod on the roof; if it has a solid sound the roof is ok; if it has a hollow or drummy sound, it means air has gotten above the roof and is in danger of falling. Recent findings on the air cannisters show they are not reliable enough for survival. The oxygen pellets are far from being useful. as what happened at the Sago mine. Cuz; Shelby