I really don't think that is what you meant to type, but it brings up another solution that permaculturist Bill Mollison suggested for remote homesteads in Australia, an insulated hole in the ground for escape from a fast-moving wildfire or firestorm.

It consists of a hole dug into the ground (or half under, half above ground), a roof, and the roof should be heavily insulated with a thick layer of soil and sown with grass or something to hold the soil in place. It should have a heavy fireproof door (at least metal-covered), with a protective dogleg of mortared stone, brick, adobe or soil in front of it to protect the door from radiant heat. IOW, an underground cellar type of structure.

Out in the wilds of Oz, they have a lot of eucalyptus trees in some areas, and they burn like tar barrels. Firestorms create their own wind, and it can be impossible to outrun them, even in a vehicle. And if Dad took the only vehicle to town to work, the people left at home have no escape.

Anyway, another method that might be useful for some people. If it were placed in the middle of a field with no trees nearby, the fire should pass over relatively quickly.

Sue