The goal of this research was to increase the safety of workers in underground coal mines by developing and in-mine testing a low-cost, available, and flexible fire safety system to reduce the spread of fire and contaminated air in or near mine shafts. The work detailed information on the magnitude of the hazard, industry acceptance of remote data acquisition systems, and alternative fire safety systems to meet four different mine profiles. A complete fire reporting system was designed, installed, and in-mine tested at a Midwest underground coal mine from April 1980 to March 1983. The surface- located master control unit provided analog displays of real-time sensor data and a printer graph-record of the last 24 hours of activity. Fire warning sensors included ionization particle sensors, electrochemical cell carbon monoxide (co) analyzers, a solid state CO analyzer, and continuous heat-sensitive wire sensors. Multiplex telemetry of data occurred on existing telephone lines and wireless radios from shafts up to a 5-mile distance. Four fire conditions occurred during in-mine testing that demonstrated the system's effectiveness. Evaluation of converting the system to meet MSHA approval is included.