Ukraine’s political and economic meltdown could spell doom – or at least delay – for a containment dome being built over Chernobyl.

Construction of the coated steel, climate-controlled sarcophagus was begun in 2010 to cover the site of the infamous 1986 meltdown, scene of the worst nuclear accident in history. But finishing the $2.1 billion project requires money and, likely, stability from the Ukraine government and international backers. Planned in sections comprised of two 300-foot-high arches that will span the site and then be walled on the sides, the project will never be completed by the original goal of 2015, officials acknowledge.

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