RedactedNarrative: Boat 1 was operated on Partridge Lake and pulled up to a spot to anchor.  Operator turned off the motor.  As other passengers were getting the anchors out, another passenger stated that he was getting into the water to pull the boat to a good spot and dove head-first off the front deck into water that was approximately 2.5’ deep.  He struck his head on the bottom of the lake and was in the water for several minutes.  Witnesses from another boat noticed that the Passenger/Injured had not gotten out of the water and was not moving.  The witnesses went over to Boat 1 and contacted the Operator.  The Operator said that he believed the Passenger/Injured person was joking around.  One of the witnesses checked on the Passenger/Injured person and found that he was unresponsive, not breathing and did not have a pulse.  CPR was administered by two of the witnesses, Passenger/Injured began breathing independently and then flown to the hospital.