Israel’s unprecedented attacks on Iran had at their core an elusive and high-risk goal: eradicating the country’s controversial nuclear program.

Roughly 140 miles south of Tehran, Natanz is considered Iran’s main center for uranium enrichment, and it was a prime target of the Israeli strikes. The damage to it appeared to be severe. It is only partially underground and was recently reinforced.

Israel’s sweeping attack across Iran struck at the heart of Tehran’s nuclear program, delivering a blow to the country’s ability to enrich uranium and potentially setting its nuclear ambitions back by months or years.