RedactedNarrative: Operator was inexperienced at driving a PWC and in addition was using excessive speed with a passenger on board.  Operator lost control when hit by a large wave and was pushed under water for more than 10 seconds.  Operator was not of legal age to be operating a PWC without being within 100' of parents or guardian.  Operator was injured (laceration) and was taken to the hospital for treatment.  No other injuries were reported.