RedactedNarrative: Vessel 1 traveling west by southwest back towards shore from center of Otisco Lake after going eb from shore. V2 is not a vessel but a 10' square platform that was moored about 50 feet from shore. The ladder of swim platform is on the north facing side of the swim platform and ramps up on top of it, striking three of the four people on the swim platform. Of the three that were injured, one  (17 yr old male) refused treatment at the scene and the other two (both 17 yr old females) were transported with serious injuries. 
  
  Operator 1 stated that he drove the jet ski out into the lake and did a few circles and then went over to the swim platform to pick up the people from the swim platform. Operator 1 stated that the brakes to the jet ski didn't work. Operator 1 was informed that that jet skis do not have brakes. Operator 1 stated that after or at the tail end of the collision, the jet ski was tipping over to the right and he started to fall off so he just jumped off.