Abstract: An enclosure for periodic movement in an underground mine to provide a place for the safety of miners. This enclosure has a frame with an envelope unit attached thereto to define an interior volume for habitating by the miners upon notification of eminent dangerous conditions or immediately after dangerous conditions exist. The evelope has at least one sealable doorway, and contains provisions to sustain habitable conditions for a selected time to permit subsequent escape or rescue. The enclosure is to be located about ninety to one hundred twenty-five yards from areas being worked by miners so as to be easily reached and entered. The size of the help unit enclosure is selected to hold a selected number of miners and the supplies for the selected survival interval. The envelope, in its preferred form, further contains circulating fans, communication equipment and other equipment for the comfort of the miners. External lighting is provided to direct the miners, as well as rescuers, to the enclosure.