On the evening of June 21 (local time), US President Donald Trump ordered the air force to attack 3 important nuclear locations of Iran, including Fordow, Isfahan and Natanz.
Although all three facilities play a key role in Tehran's nuclear technology development program, information related to these facilities is rarely disclosed.
Isfahan is located in central Iran, where the country's largest nuclear research complex is located.
The facility was built with foreign aid and opened in 1984. There are about 3,000 scientists working here and the site is considered the heart of Tehrans nuclear program, according to the nuclear Threat Prevention Initiative (NTI).
Notable facilities in Isfahan include three small research reactors, one conversion facility, one fuel factory, and one zirconium packaging plant.
Meanwhile, Fordow is known as Iran's "nuclear fortress". This area is located near the city of Qom and is located deep within a mountain range. Most of the information about Fordow comes from Israeli intelligence.
According to Israeli intelligence, the main compartments are estimated to be about 80m to 90m underground. Tel Aviv officials confirmed that the US is the only country with such a deep impact by bombs.
Recent reports from the International Atomic Energy Agency IAEA show that Iran has increased production of enriched uranium to 60% in Fordow. This facility currently contains 2,700 centers.
Natanz is considered Iran's largest uranin enrichment facility, about 250km from the capital Tehran.
Analysts said that Natanz is used to develop and assemble centrif off vehicles for enriching uranium, a key technology that converts uranium into nuclear fuel.
According to NTI, Natanz has five buildings on the ground and three underground structures, two of which can hold 50,000 centers.
IAEA revealed that Iran has enriched uranium to a 100% pure level at its Experimental Fuel Enrichment Plant on the ground.
