It would be an oven inside. I read about a couple who survived the Santa Rosa fire by getting in their swimming pool. Barely survived, as the air was so hot they could barely breathe it, damaged their areways and lungs I understand. And the water was so cold, they nearly got hypothermia.

Aluminum wheels on autos were melting. The safe room would need to have huge amounts of compressed air, some means of cooling, and that would take power. Very tall order.

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1986 300SDL, 362K
1984 300D, 138K