RedactedNarrative: On July 30, 2016 I, Game Warden was aboard my vessel on patrol at Lake Mead National Recreation Area.  At Approximately 6:08pm, I was notified by National Park Service (NPS) Ranger about a vessel taking on water just outside of Callville Bay.  (36.1388, -114.7060)  Ranger1 boarded my vessel and we drove to the location.
  
  Upon arriving at the location I observed two subjects on shore on a rocky point and one subject in the water.  A NPS vessel was also on scene operated by NPS Ranger who was yelling instructions to the three subjects and tossing life jackets to them.  Winds were approximately 15-25mph and wave heights reached approximately 3-4 feet, making it extremely difficult to move the vessels into shore.  
  
  As both Rangers and I tried to develop a plan to rescue the subjects, two by-standers on PWC moved in and pulled the subjects from the rocky shore and drove them to the NPS vessel.  Ranger1 transferred onto the NPS vessel and the 3 subjects were placed aboard.  Ranger drove to Callville Bay Marina for the investigation and I followed.  Upon arriving to the Marina, I observed a blue and white open bow vessel with two subjects aboard. 
  
  I first asked subject1 who was driving the vessel at the time of the sinking.  He stated it was \ Subject2.  I then asked Subject2 who was driving the vessel at the time of the sinking, and he stated it was Subject1.  I then asked everyone else in the vessel who was driving at the time of the accident and they all stated they did not know, as they were sleeping when the vessel first started taking on water.  
  
  At this time Subject2 asked Subject1, “Do I need to be the driver-” and Subject1 nodded yes.  Subject2 then informed me he was the driver, he just forgot.  I then interviewed Subject2 about the vessel accident.  Subject2 stated they had taken the vessel out to Sandy Cove about 9:30am.  They were returning back to Callville Bay Marina when the engine stalled.  The waves were very large and came over the stern of the vessel swamping it and ultimately sinking it.  Subject2 and another unidentified subject then left aboard the blue and white vessel to try to recover the sunken vessel.
  
  Subject1 was left behind and decided to answer more of my questions.  Subject1 stated they had been at Sandy Cove most of the day. Subject1 stated Subject2 was driving when the engine stalled.  The boat started taking on water from the large waves.  The boat started to sink and everyone swam to shore.  Subject2 was picked up from a by-standard with the intention of returning with another vessel to rescue the remaining three occupants.  Subject1 was diving down trying to recover what he could when the NPS vessel arrived.
  
  Subject1 admitted to drinking that day and having a 750ml bottle of vodka on the vessel.  Subject1 stated that Subject2 did not drink that day. All subjects were evasive in their responses and did not want to cooperate with the investigation.  A wants check was conducted by NPS on Subject1 and he was found to have a lengthy history and multiple warrants.  NPS Ranger notified Subject1 that he had 72 hours to recover his vessel or NPS would recover it for him and charge him for it.  We then cleared from the scene.