This is the terrifying nuke the U.S. hopes it never has to use against Iran
The good news: Iran seems to be living up to its end of the treaty with six other nations that requires a halt to Iran's uranium enrichment and processing activities. In short — they can't make nuclear weapons.
The bad news: Last December, Iran launched the second ballistic missile testin violation of its nuclear arms agreement. The missiles are housed in an underground storage bunker 1,640 feet underground.
One of Iran's former nuclear enrichment sites, known as Fordow, is built into a mountain and is designed to withstand an aerial bomb attack. A story in The Washington Post in 2012 called the site "impregnable." The Post said Fordow was engineered to repel massive attacks and was modeled after North Korean bunkers.