Answer: assumption of the risk
Explanation: In case of any dispute, if the defendant succeed to prove the court that the the plaintiff knowingly took the potential risk of the activity which he or she was participating, then under the assumption of risk court can reduce or bar the recovery of that plaintiff.
In the given case, Andy signed a waiver before going for the dive. That waiver is a proof that he himself assumed the risk.
Thus, he will not recover his injuries under the defense of assumption of risk .