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Best way to approach cutting this out

Cut a guideline around the diver, but I still have this aqua blue layer around him to get rid of, any ideas on how to get rid of it?

Already tried colour range and sampling the outer colour, but theres specs of the same shade on the diver himself. New to photoshop by the way, would greatly appreciate the help!

Screenshot 2019-04-02 at 20.29.30.png