To escape the flames, firefighters have used spray systems and held up heat blankets to windows inside the cabin. These terrifying moments when flames can overrun and burn over a fire truck are called flashover or burnover.

What is a Burnover?

: an imperfectly burned brick that requires reburning.

Has anyone survived in a fire shelter?

Since the fire shelter became mandatory equipment for federal wildland firefighters in 1977, it has saved the lives of more than 300 firefighters, Carrie Bilbao, a spokeswoman for the National Interagency Fire Center, told ABC News.