Iran’s underground missile cities, located up to 500 meters beneath mountains, form a vast and highly secretive network ...

The activity comes at a time of heightened tensions as talks between Iranian and US officials continue over Iran's nuclear programme.

Tehran may have used the delay in the US's potential strike to make the beneath-mountain facility nearly untouchable.

Military analysts believe the facilities are designed to protect weapons from air strikes and allow launches with limited warning. The system is operated by the Islamic Revolutionary Guard Corps (IRGC ...