RedactedNarrative: At approximately 1920 hours on July 15, 2017, a vessel was cruising south in the area of Lover''s Cove on Lake Mead when its lower unit struck a rock.  There were no injuries.  The occupants donned their PFDs.  After the collision, the vessel lost propulsion and drifted into shore at Lover''s Cove.  The occupants spent the night on shore.  On the morning of July 16, 2017, the occupants were rescued by National Park Service personnel and transported to Las Vegas Boat Harbor.  The vessel was left where it was for operator to make arrangements for recovery.