RedactedNarrative: On June 29, 2017 at approximately 18:30 hours I was informed by subject, as I was leaving the marina in the 27 ft vessel and as he was towing in another vessel, that his pontoon boat had sunk but everyone was off the vessel and OK and the vessel was still out in the lake.  I informed him that when I got back we could talk about the timeline on recovering the vessel.
  
  While out on the water investigating an algae bloom I stumbled onto the sunken pontoon boat.  It was upside down with the bow sticking out of the water about 4 - 5 feet.  I notified dispatch of its location and that it would stay in place for a couple of days.  When I returned to the park SUBJECT was not located and we started calling each other.  Once we got a hold of each other he stated that operator1 had run his pontoon boat onto Bird Island and while towing it back it had sunk.  SUBJECT stated that the operator1 was fine and had left the park.  He stated he had their contact information and would pass it to me in the morning.  
  
  At about 20:00 hours Operator1 contacted me via dispatch.  He informed me that he was on his way to the airport with his family to return to New York.  He provided me his email address and agreed to provide me with witness statements from everyone on board the vessel.  I asked him what happened and he stated that the pontoon boat would not start and that while being towed back by SUBJECT that the vessel sank out from underneath him.  He stated that everyone was OK.  He also stated that he never once felt the vessel strike any object that could puncture the pontoons.
  
  On July 1, 2017 a buoy was placed on the sunken vessel and dispatched was informed of the vessels adjusted location.  With the holiday weekend removing the vessel had become impractical and there was no sign of oil or fuel leakage.  The vessel was finally removed on Wednesday July 5, 2017.
  
  Operator1 sent me witness statements on July 11, 2017 and SUBJECT provided me his witness statement on July 14, 2017. Injury-was sustained when the injured was thrown from the vessel during its capsizing. 
  Vessels- Vessel 1 is the rental pontoon boat that capsized; vessel 2 was an open motor boat that retrieved all occupants of vessel 1 and returned them back to the marina; vessel 3 was a PWC and the tow vessel.
  Capsizing- The vessel did not ground at any time, damage that caused hull failure must have occurred prior to this rental time period.
  
  
  END REPORT