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Iran's Fordow Fuel Enrichment Plant is deep underground.
By Katie Bo Lillis, Davis Winkie, Zachary Cohen and Natasha Bertrand, CNN
In recent weeks, Iran has dramatically escalated efforts to seal off its cache of near bomb-grade uranium, deliberately collapsing tunnels and booby-trapping entrances with explosive mines, according to five sources familiar with US intelligence.
Getting to the roughly half a tonne of highly enriched uranium (HEU) was now far more difficult, dangerous and time-consuming than it already was just a month ago, when US President Donald Trump was publicly signalling that he might order the US military to seize it, the sources said.
