The firefighters sounded a Mayday. On hearing the Mayday, firefighters who had just evacuated the building quickly re-entered with hoselines and started to knock down the fire. They found the firstfloor room through which the firefighters had entered the basement. The ceiling had collapsed into the room and it was heavily involved in fire. They located firefighters who had been buried under the debris of the collapsed ceiling and after a prolonged effort the firefighters who were still in the basement.