Iran’s uranium is stored in reinforced underground bunkers; reaching and breaching these vaults would be problematic, to put it mildly
Uranium is a hazardous substance that requires careful handling, and extracting several hundred kilograms — which Iran is believed to possess — would require a significant amount of specialised machinery and equipment
Any such operation is unlikely to go unopposed, and damage to a uranium container during loading could result in radioactive contamination of the surrounding area
Therefore, Tsipis argues, such an operation is unlikely to take place.