ON₂ Solutions build a complete Mine Refuge System designed to provide a breathable air supply in the event of an underground emergency. The “TommyKnocker” and award-winning “Refuge One Air-Centre” provide a Safe Haven with up to 96 hours of re-breathable air to both permanent refuge stations and mobile refuge chambers until rescuers arrive. Our Mine Refuge System operates independent of any external compressed air or electricity. ON₂ currently has over 250 TommyKnockers and over 400 Refuge One Air-Centres operational in mines worldwide.