RedactedNarrative: On Saturday, May 16, 2015, at approximately 1430 hours, a tube being towed by a Personal Watercraft (PWC) struck a dock located behind a private residence on East Lake. This accident caused injury to the two occupants on the tube. One of the individuals was transported to Saint Joseph's Main Hospital in Tampa via helicopter and was being treated for a traumatic brain injury. The other individual was transported to St. Joseph's Hospital North, where he was treated for a laceration to the lower left extremity and released from the hospital. All four individuals involved in this accident are juveniles. 
  
  Operator stated that he was pulling the tube around in circles (counter-clockwise) on East Lake. 
  
  Operator stated he was unsure as to how fast he was going however; he stated that he was on a plane. Operator stated as he was coming out of the circle, a green in color PWC (V-2) operated by his friend crossed in front of him. Operator stated he quickly steered V-1 to the left and immediately back to the right in order to avoid a collision with V-2. This evasive action launched the tube to the left side (outside the wake) of V-1. The tube was headed straight for the dock. 
  
  Tuber1 rolled-off the left side of the tube just prior to the tube colliding into the dock. The tube with Tuber2 still on it collided into the dock. The fabric with the toe eye on the tube completely tore-off the tube and the toe-hook on V-1 ripped-off upon impact. 
  
  Operator turned V-1 around with Occupant still on-board and immediately went towards the dock to assist Tuber1 and Tuber2. Operator stated he assisted Tuber1 onto V-1 and swam over to Tuber2 who was up-right underneath the dock. Operator stated that Tuber2 was unconscious. Operator and Occupant pulled the tube with Tuber2 (who was unconscious) inside, out from under the dock and pulled him to shore. At that time, a neighbor called 911. Friend of operator, who was operating V-2 immediately went to a nearby park to get help. Friend stated he immediately returned with the owner of V-1. 
  
  Conclusions: 
  Based on the information received during this investigation, the contributing factors to this boating accident are as follows: 
  
  V-1 operator has less than (10) hours of experience operating a vessel and V-2 operator has less than (5) hours operating a vessel. Both V-1 and V-2 operators failed to attend a boater’s safety course as required by Florida law. 
  V-2 operator was traveling southbound in East Lake approximately 70’ west of the shoreline. V-2 operator observed V-1 pulling a tube in circles however; continued his course of travel failing to provide adequate space for V-1 to operate in a safe and prudent manner. 
  
  V-1 operator was pulling a tube in circles (counter-clockwise) and decided to change his course of travel. As V-1 operator changed his course of travel, he failed to observe V-2 (who was close to his proximity) coming across his path of travel, which resulted in him having to make a last second evasive move, to avoid colliding into V-2. 
  V-1 operator was pulling the tube with occupants too close to a dock, which resulted in the tube with occupant colliding into the dock. 
  
  TUBER2 Sustained serious bodily injury to include blunt force trauma to the head, brain edema, cerebral hemorrhage, and abrasions on his lower left extremity at the ankle and knee area.; TUBER1 sustained a laceration to the lower left extremity and contusions.