On 2 March 2018, a Cessna 441 conducting a single-pilot scheduled passenger flight to Broome suffered successive failures of both engines due to fuel exhaustion and a MAYDAY was declared. Unable to reach the destination or any other aerodrome by the time this occurred, an uneventful landing was made on the area’s main highway. The Investigation found that the fuel quantity was over-reading due to water in the fuel tanks, that cross-checking of fuel used versus indicated fuel in tanks was not done and that when the possibility of fuel exhaustion was first indicated, an available diversion was not made.