RedactedNarrative: We responded to Katherine's Landing Boat Launch and docked our vessel at approximately 12:59 p.m.  We saw NPS personnel treating an injured female (Tuber1) on the stern of AZ XXXX XX (Vessel 1, V1).  Two CareFlight helicopters landed at approximately 1:16 p.m.  I assisted medical personnel in loading an injured male (Tuber2) onto a stretcher for transport.  Tuber2 and Tuber1 were transported from Katherine's Landing by CareFlight to University Medical Center at 1800 W Charleston Blvd, Las Vegas, NV 89106.  Tuber2 had a right pelvic fracture and right femur fracture.  Tuber1 had a right femur fracture and left foot fracture.  Tuber1 also had abrasions or punctures to her lower jaw/throat.
  
  I made contact with Operator1 who stated that he was operating V1 when the collision occurred.  Operator1 stated that he was towing two individuals (Tuber2 and Tuber1) behind V1 on a two-person inner tube north of Telephone Cove, later identified as Newberry Cove, at approximately 20 mph.  Operator1 stated that he made a turn from west to south between rocks in the cove.  Operator1 stated this is when Passenger1 stated the rope towing the inner tube came off of V1 and the inner tube continued outwards from V1 in an arcing motion and made contact with rocks along the shore.  Operator1 stated he turned V1 around and proceeded to where the inner tube was.  He left V1 to tend to Tuber2 and Tuber1 who were thrown from the inner tube and now injured.  Operator1 stated he loaded both individuals onto V1 and proceeded to Katherine's Landing.
  
  I made contact with Passenger1 who stated that she was an occupant aboard V1 and was seated behind Operator1.  Passenger1 stated that Tuber1 was on the starboard side of the inner tube and Tuber2 was on the port side of the inner tube.  Passenger1 stated that as V1 was turning, the rope attaching the inner tube to V1 broke and the inner tube proceeded into rocks.  Passenger1 stated that she left V1 to assist Tuber2 and Tuber1.  Passenger1 stated that Operator1 did a few compressions on Tuber1 because she was in shock and he wanted to make sure she was breathing.  Passenger1 stated another vessel arrived and its occupants assisted in loading Tuber2 and held Tuber1 on the stern of V1.  Passenger1 stated she called 911.
  
  I made contact with Passenger2 who stated that the rope towing the inner tube from V1 broke and the inner tube proceeded into rocks.  Passenger2 stated that she stayed on board V1 with her son (Passenger3, not on scene) and asked a passing vessel to call for help.  Passenger2 stated that this vessel returned with another party and that they helped load both injured parties onto V1.  Passenger2 stated V1 returned to the dock where help was waiting.  Passenger1 stated that Passenger2 was seated to the left of Passenger1 with her son in her lap. 
  
  Injuries appeared consistent with an impact on the right side of both Tuber2 and Tuber1.  It appeared as though V1 operated through an approximately 30 yard opening in Newberry cove and at some point the rope attached to V1 towing the inner tube with Tuber2 and Tuber1 broke from the force applied to it.  No evidence was found in the area where Operator1 and Passenger1 indicated the inner tube impacted rocks.  
  
  Statements and injuries indicate V1 was operating at too great of a speed and close to shore when the collision occurred.  Damage identified on the rope was likely caused by force applied to the rope.  Operator1 is at fault for violations of Rule 6 (safe speed) of the United States Coast Guard Inland Navigation Rules adopted under NRS 488.540 and NAC 488.430 and NRS 488.600 (Unlawful operation of vessel: Reduced speed required in certain areas).