The Three Nuclear sites

1. Fordow is Iran’s most important nuclear enrichment facility, buried deep inside a mountain to guard it from attacks.

The main halls are believed to be some 80 to 90 meters (262 to 295 feet) below ground. Analysts have long said that the US is the only military in the world with the kind of bomb required to burrow that deeply – the enormous, 30,000-pound GBU-57.

The US used six B-2 bombers to drop 12 of those “bunker-busting” bombs on the site, a US official told CNN.

2. Natanz is the site of Iran’s largest nuclear enrichment center and was targeted in Israel’s initial attack on Iran on June 13. The site has six above-ground buildings and three underground structures, which house centrifuges – a key technology in nuclear enrichment, turning uranium into nuclear fuel.

The above-ground facilities were damaged in Israel’s initial attack. The IAEA said the strikes damaged electrical infrastructure at the plant.

Although it is not clear if Israel’s strikes caused direct damage to the underground facilities, the IAEA said the loss of power to the underground cascade hall “may have damaged the centrifuges there.”

3. Isfahan, in central Iran, is home to the country’s largest nuclear research complex.

The facility was built with support from China and opened in 1984, according to the nonprofit Nuclear Threat Initiative (NTI). Some 3,000 scientists are employed at Isfahan, NTI says, and the site is “suspected of being the center” of Iran’s nuclear program.

Following the US strikes, at least 18 destroyed or partially destroyed structures could be seen in satellite imagery, a CNN analysis found. The site was visibly blackened by the degree of rubble thrown up by the strikes.

Read details at CNN