Only now is it becoming clear how Iran has survived the combined might of the US and Israeli military for over a month: cast underground tunnel systems, packed with fuel, drones and missiles. Our reporter Shokoofeh Azar is here.

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This episode of The Front is presented by Claire Harvey, produced by Kristen Amiet and edited by Tiffany Dimmack. Our team includes Lia Tsamoglou, Joshua Burton and Jasper Leak, who also composed our music.

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Inside Iran’s secret underground ‘military cities’