RedactedNarrative: According to the report, vessel one was travelling on plane while towing a tube with multiple subjects. The tube encountered a wave and two of the tube passengers (Injured 1 and 2) collided heads. Injured 1 sustained a head injury and was transported by EMS. Injured 2 also received a head injury but was not transported and did not require medical attention beyond first aid. All subjects involved were wearing PFD's at the time of the incident.