The concrete cover was not built for perpetuity. It had begun to weaken in parts, and there was a danger rainwater could spread contamination, as the sarcophagus was not watertight. Now, 30 years later, a larger, more lasting dome is finally complete.

And what a steel containment dome it is. At 350 feet tall by 840 feet wide, the arched building is the largest mobile structure anywhere on land, which was slid into place over the remains of the power plant. It took two weeks to move the building via a system of hydraulics. The dome, a hundred times as heavy as the Statue of Liberty, came with a nearly $1.6 billion price tag.

“Moving together the two halves of the huge arch of this gigantic shelter is like closing a wound, a nuclear wound that belongs to all of us,” the director general of the International Atomic Energy Agency, Hans Blix, told the Guardian.

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Completed after more than a decade of design and labor, the building is slated to shield the area for the next century. The structure was developed to weather a magnitude-6 earthquake and Level-3 tornado, Deutsche Welle reported.

Despite the new dome, radiation levels in the Chernobyl exclusion zone — at 1,000 square miles, an area just slightly smaller than Yosemite National Park — will remain elevated. Visitors are not permitted to enter the area without authorization.

“Let the whole world see today what Ukraine and the world can do when they unite, how we are able to protect the world from nuclear contamination and nuclear threats,” Ukraine’s president, Petro Poroshenko, said during a ceremony Tuesday, according to Reuters.

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There was no indication of what the apparently thriving Ukrainian deer, foxes and other woodland creatures think of the giant addition to their habitat.