Cal. INS § 531

An insurer is liable: (a) Where the thing insured is rescued from a peril insured against, and which would otherwise have caused a loss, if, in the course of such rescue, the thing is exposed to a peril not insured against, and which permanently deprives the insured of its possession, in whole or in part. (b) If a loss is caused by efforts to rescue the thing insured from a peril insured against.