RedactedNarrative: On the above date and time, vessel1, a 10ft PWC was towing two subjects on an inflatable tube type ski.  As Operator was attempting to make a turn, the tow line broke causing the tube to flip.  As a result the two subjects on the tube struck each other head to head.  One of the subjects, sustained facial injuries and a concussion and was transported to Lady of the Sea Hospital and later airlifted to University Hospital in New Orleans. the other subject was treated at Lady of the Sea and released. Neither alcohol or drugs or criminal negligence considered as a contributing factor in this incident.