President Trump has publicly threatened to strike an Iranian site many Americans had never heard of until this month. Here are five facts about Pickaxe Mountain, a deeply buried facility that could hold the key to the Iranian nuclear program

  1. It’s a fortified underground complex next door to Iran’s main nuclear enrichment site.

  • Known in Persian as Kuh-e Kolang Gaz La, it sits less than a mile south of the Natanz nuclear complex, about 140 miles south of Tehran.
  • Satellite imagery shows construction began around 2020, with the compound covering roughly one square kilometer of mountainside in the Zagros range.

  1. It may be beyond the reach of America’s most powerful bunker-buster bombs.

  • The facility is buried as deep as 2,000 feet beneath granite — deeper and more fortified than the Fordow plant U.S. forces struck in June 2025.
  • Analysts say those depths pose a serious challenge even for the most advanced bunker-penetrating munitions in the U.S. arsenal.
  • Pickaxe went untouched in both the June 2025 twelve-day war and this year’s strikes, even as Iran’s three other main nuclear sites were severely damaged.

  1. Nobody outside Iran knows for certain what happens inside.

  • Iran has maintained since 2021 that the site is a centrifuge manufacturing and assembly plant.
  • Western intelligence agencies suspect Tehran may also be building an undeclared uranium enrichment facility there.
  • The International Atomic Energy Agency has never inspected the site — Iran never declared it an enrichment facility and suspended the safeguards protocol covering centrifuge plants.
  • Analysts note its size and depth would also suit enriching uranium or storing near-weapons-grade material out of reach of airstrikes.

  1. Iran reportedly moved thousands of centrifuges into the mountain after the 2025 war.

  • U.S. and Israeli officials say the transfer happened in fall 2025, after previous strikes damaged Iran’s three main nuclear sites.
  • Officials worry the move ensures Iran can keep enriching uranium even if its other facilities are destroyed.
  • Analysts say the ability to rebuild centrifuges is central to how quickly Iran’s program could bounce back.

  1. The site has become a flashpoint in the current U.S.-Iran confrontation.

  • In a July 13 radio interview, President Trump warned, “We’re going to take out Pickaxe Mountain,” as U.S. forces conducted new strikes on Iran.
  • New satellite imagery indicates construction is continuing — activity analysts say violates the June 17 U.S.-Iran Memorandum of Understanding barring construction at nuclear sites.
  • Trump has said he would insist inspectors gain access to the tunnels before signing any new agreement with Tehran.
  • Iran, for its part, denies seeking a nuclear weapon.

Why Pickaxe Mountain Matters

Pickaxe Mountain captures a central dilemma of the U.S.-Iran standoff: a site too deep to bomb with confidence and too opaque to trust without inspections. If no one outside Iran can verify what is happening beneath the granite, the facility will remain both a military problem without a clean military solution and a diplomatic problem no agreement can ignore.