On the 16th September 2021 at approx. 10:15 an OFSAT prime mover and lowbed trailer were transporting an 80t capacity (rough terrain) crane to the old location of Rig 64 which was located in Burhan. When they were approx. 1 km from the old location, the driver and his passenger (crane operator) felt a sudden jerk, unusual noise and the front of the prime mover raised up slightly. After they had stopped, both occupants exited the vehicle to find that the lowbed trailer had disconnected from the prime mover, had fallen to the ground and the restraining chains holding the crane had snapped which allowed the crane to roll forward and off the trailer onto the side of the road