An experiment to assess the survivability of typical mine stability instrumentation during the explosive rubblization of the retort bed of Mini-retort 3 carried out by Sandia National Laboratories, Albuquerque (SNLA) in Occidental Oil Shale Inc.'s (OOSI's) Logan wash Research Mine. Stability instrumentation consisted of appropriately place borehole stressmeters and extensometers. Environmental parameters were measured using accelerometers and temperature sensors. Prompt and long term rubble pressures were measured in the lower room of the retort using special pressure cells. With the exception of one extensometer string and one stressmeter, all mine stability instrumentation functioned during the blast. The failure of the stressmeter was cause by internal electrical failure prior to the shot. Some accelerometers failed owing to malfunctions that developed as a result of adverse pre-shot environmental conditions.