RedactedNarrative: Operator 1 was operating stand-up vessel 1 without a pfd.  Operator was traveling straight and attempted to turn in an unknown direction and fell off vessel 1.  Operator 1 attempted to swim back to vessel 1 which was idling in circles near operator 1.  Operator 1 became fatigued and yelled for help.  Attempts from operator 1's friends failed and for their own safety, they returned to shore.  Operator 1 went under the surface of the water and did not re-surface.
  
  Vessel 1 was not damaged.
  