RedactedNarrative: Airboat was operating in restricted area of Lake Monroe Conservation Area.  Vessel was traveling through narrow trail of palm trees and scrub.  This area is not normally accessible to airboats.  River water levels are excessively high, allowing thin (shallow) water to cover area.  Airboat was maneuvering through this shallow area, when operator apparently blacked-out (due to medical condition) and struck palm tree with the left side of air prop enclosure.  The prop enclosure was crushed causing catastrophic damage to air props.  Vessel then lurched forward and struck another palm tree (damaging the front) (see attached photos).