A truck rolled away down a slope after a crew member closed the cabin door while putting away a lunchbox. The truck crashed through a fence and fell off a retaining wall 5 meters high, though no one was injured as the vehicle was empty. An investigation was launched into the incident and immediate actions taken included notifying emergency services and arranging for the truck's safe removal and fence repairs. Going forward, corrective actions include avoiding parking on slopes where possible, ensuring handbrakes are engaged and vehicles in gear when parked, and using wheel chocks if slope parking cannot be avoided.