The ATLAS detector is about the size of a five story building.

A system for finding and rescuing persons in case of an accident in the ATLAS area has been conceived by ATLAS members. A large number of infrared sensors installed at the experiment site will allow an operator in the Control Room to follow the movements of all persons in the ATLAS cavern. The system can be installed at very low costs in virtually all types of environments and is suitable in large areas such as mines where people are often difficult to find. In case of emergency, especially if smoke or fog is present, it helps a rescue team to locate persons in danger. Emergency Personnel Location Credits: Laboratorio de Instrumentação e Física Experimental de Partículas (LIP)