RedactedNarrative: On Saturday May 23 , 2015 , Myself and Cpt. were patrolling Ft. Loudon Lake. At around 330pm We received a call from TWRA dispatch informing us of a boat sinking just upstream from Duncan boat dock. We arrived on scene a few minutes later and found a Master Craft boat (V1) that was transferring passengers to another vessel. Upon contacting the occupants we noticed the boat taking on water from what appeared to be the engine compartment. A second vessel on scene secured a rope to V1 and towed it to subject’s home. The boat was placed on a lift and the bilge pump ran for several minutes. Upon closer inspection it was discovered that there was damage where the prop shaft enters the hull / engine compartment. This was allowing the vessel to take on water. The operator indicated that a vibration occurred while the vessel was in operation and the engine died. It was then that he noticed the vessel taking on water and called for help.