The New Safety Confinement took nine years to build and has a mammoth total weight of 36,000 metric tons  

In 1986, Reactor 4 of the nuclear power plant blew up and flooded the north of Ukraine with deadly radiation

This facility was designed to trap the radioactive debris and prevent further crumbling of the reactor

A £2billion project to confine the leaking of radioactive debris at the Chernobyl nuclear plant has been unveiled.

The structure – which took nine years to build – was constructed to secure the molten reactor core and 200 tons of radioactive material at the site.

Officials have described the shelter as the largest moveable land-based structure ever built, with a span of 257 metres and a total weight of over 36,000 metric tons.

Reactor Number 4 at the plant in what was then Soviet Ukraine exploded and burned on April 26, 1986, spewing radiation across Europe in the world's worst nuclear accident.