CA Ins Code Section 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.