Why do firefighters make holes in walls?

Firefighters make holes in walls to check for fire extensions after the main body of fire has been extinguished. Also when a fire is located behind the wall, the wall must be opened to extinguish the fire and check properly for any fire extension. Occasionally firefighters must make holes in walls to make an emergency exit from a life-threatening environment when the more conventional means of egress have been rendered inaccessible.

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