Geevor had two rescue teams which were available at all times in case of emergency.
The mine rescue team wore breathing equipment consisting of a tank of oxygen connected to a rebreather bag, like a life jacket, which contained chemical that absorbed carbon dioxide. The teams could then breathe clean air for up to two hours. It was not possible to speak whilst wearing the breathing equipment so the teams communicated using horn signals.
Photograph reproduced with the kind permission of Chris Elson held by the Geevor Archive