The aim of this literature review was to find the state of the art of how rock behaves at high temperatures caused by a fire, but very little information was found. Some large scale fire tests have been performed in rock tunnels, but only a few of the reports from these tests mention anything at all about what happened to the rock during the test. In a few cases it has been noted that rock fell from the roof during and after the fire, but no investigation of the cause of these rock falls has been made. During most of the large scale fire tests performed in rock tunnels, the rock has been protected from the heat to prevent fall-outs. It seems no tests have been performed to check the actual behaviour of rock during a fire.