https://www.cnn.com/2025/06/17/middleeast/iran-fordow-nuclear-site-latam-hnk-intl \
Its main halls are an estimated 80 to 90 meters (around 262 to 295 feet) beneath the ground
The US Air Force has said that the GBU-57 can penetrate up to 60 m (200 ft) of unspecified material before exploding