RedactedNarrative: Deck boat vessel rented by occupants from Callville Bay Marina. 8 occupants total were tubing for recreation outside of Sandy Beach area on the Boulder Basin of Lake Mead. 
  
  At the time of the accident, 7 occupants were aboard the vessel and one passenger was being towed on a tube. 
  
  Parties state that they were approaching the "no wake" zone of Sandy Beach, and as the Operator was slowing the vessel the patient stood up from a seated position to retrieve a bottle of water from a cooler. When the patient stood up, he lost balance while standing on the floor of the deck boat. 
  
  Patient fell onto his back and aggravated a previous back and neck injury. Patient complained of neck pain on a 10/10 scale and the party returned to the Callville Bay Marina to contact help. Patient reported hearing and feeling a "pop" in his neck from the fall onto the floor of the deck boat. No property damage resulted, and no further injuries reported. 
  
  Patient transported to UMC trauma hospital for further treatment and evaluation.