Work has finally begun to start moving the immense radiation shield that has been built to cover the still-dangerous Chernobyl reactor.
It has taken nearly 10 years to build and is expected to shield the world from the leaking reactor for the better part of a century.
The moving process should take about a week and involves a network of hydraulic pumps inching the vast shield over the old reactor building.
At 275m wide and 108m tall it is widely considered to be the largest moveable land-based structure ever built by man.
The European Bank for Reconstruction and Development has been leading the project and estimates that when finished it will have cost around £1.3bn to construct.
Officially called the New Safe Containment, the giant shell had to be built away from the reactor because radiation levels directly above the reactor are still far too intense.
Once the building is moved into position over the reactor work will begin on finally trying to dismantle the damaged building within and safely removing the radioactive material inside.
Chernobyl remains the worst nuclear disaster in history when in 1986 a huge explosion blew the roof off the reactor building.
The resulting fallout spread over large parts of Russia and Europe leading to the evacuation of over 100,000 people and the abandoning of the city of Pripyat.
