The aim is that the postgraduate student should, after completion of the course, be able to understand physical principles related to fire development, ventilation, and fire dynamics (visibility, gases, temperatures, heat fluxes, flame length, fire spread etc.) in underground structures. The student should also understand the principles for production of toxic species in underground structure fires and their effects on persons exposed to the fire gases and the smoke. Furthermore, the student should be able to derive and apply mathematical methods relevant for the fire development, spread of fire and exposure to occupants present in the underground structure at the time of the fire. The aim of the course is also that the student should be able to understand important aspects of heat flux exposure to underground structures as well as the effects of ventilation conditions on fire development in different scales.