A 14 second time-lapse taken Oct 22, 2019 of the final 10 meters the 6 hour and 65 meter move of the Danish lighthouse Rubjerg Knude, to save it from crashing down the 60 meter cliffs creeping ever nearer due to coastal erosion. This time-lapse is speeded up 240X
To be able to move the lighthouse the foundation first had to be strengthened and giant steel girders run through the base of the building. A 14 meter wide path was prepared, packed and leveled. Steel plates were layed as a foundation and then steel rails mounted on top of the steel plates. Wheels were mounted on the rails and then the entire structure was lifted with hydraulic jacks under the supporting steel girders. When it was time to move computer controlled hydraulic arms mounted behind the lighthouse locked into slots in the rail and then pushed the lighthouse forwarded. When the hydraulic arms were fully extended they released from the slots in the rail, contracted and engaged with with the next set of slots and the process was repeated. The original pace was intended to be 8 meters per hour, but it turned out the lighthouse weighed less than anticipated and the actual pace was closer to 13 meters per hour.
This method of moving the lighthouse is frequently used to quickly move new bridges into place under existing roads and highways when upgrading infrastructure.
The cost of the move is 5 million DKR. Even this move is only temporary, since it is expected that in 40 years the cliffs will once again threaten the lighthouse.