RedactedNarrative: Deceased had just bought a raft and brought it into the water and boarded it.  He was drifting in the water when his 2 friends on shore decided it would be amusing to throw a rock at the deceased in a joking manner.  He started to drift away from them at a quick pace.  They could see the raft taking on water, the deceased panicking and then jump off the raft.  The raft and deceased began drifting with the current. There was a small craft warning issued that say.  From shore his friends could see the victim struggling to swim.  They saw him begin to start go under the water and come back up.  All 3 friends on shore attempted to swim to rescue him.  2 of the men only made it half way and were brought back to shore by a vessel in the area due to the cold water and their motor functions beginning to fail.  One friend made it to the deceased (at that time he spoke to him) and attempted to hold him up but it became difficult with the large swells and high winds.  At this point a woman on a personal watercraft arrived to help them but at this point the deceased was unresponsive and the other man was exhausted and very weak.  She attempted to tow them to shore several times but the man kept loosing his grip on the PWC.  She then saw a man jump from the pier so she went over and picked him up so he could help her rescue the victims.  At this point the Fire department boat arrived and helped them get the unresponsive male on board.    Another passing boater took the 2nd male on board and brought him to shore.  They attempted to tow the PWC to shore with this boat but due to the a line from the life ring that was thrown to the victim became tangled in it making it inoperable.  As they started to tow the PWC it tipped over sending the 2 persons on board in the water.  They were brought to shore by the harbor master's boat that had just arrived on scene.  
  
  The men listed as injured were not on the raft at any time.
  
  Upon inspection of the raft it was determined that the raft was under inflated to the point where the raft could be easily compressed with a minimal amount of hand pressure.  It appears that the gunwale area was never inflated.  No tears, rips or patches were found on the raft.  Under inflation of the raft in rough sea conditions was the cause of this accident.