When collapse is suspected, what is the only permissible action inside the collapse zone?

• A. To enter the collapse zone with shielded PPE
• B. To ventilate the area
• C. To cautiously place unstaffed master stream devices and then immediately withdraw
• D. To perform interior search

Answer: (C)

When collapse is suspected, the priority becomes protecting firefighters by keeping anyone out of the collapse zone and seeking to control the fire from a safe location. The only permissible action inside the collapse zone is to cautiously place unstaffed master stream devices to deliver water and then immediately withdraw. This approach allows cooling and knockdown of the fire without putting personnel at risk, since the devices operate from a distance or boundary and do the work without an interior crew exposed to potential collapse. Any interior search, ventilation, or entry with PPE would place firefighters in extreme danger under these conditions.