RedactedNarrative: Operator 1 was operating vessel 1 while cruising on plane. As vessel 1 was on plane operator 1 stuck a fixed object (standing tree) in the waterway just below the surface of the water. This caused all occupants on vessel 1 to be thrown from their seats. Occupant 2 who was holding occupant 3 was ejected from their seat and struck something on the floor of vessel 1 causing them to sustained injuries. Occupant 3 landed on occupant 2 causing them to sustain injuries. Occupant 4 was ejected from their seat and struck vessel 1's front gate causing them to be ejected overboard. Occupant 4 was rescued by operator 1 and also sustained injuries. There was extensive damage vessel 1 below the waterline to all three pontoons.