Iran revealed a secret underground missile base in an unprecedented broadcast on Iranian state television on Wednesday, showing where medium and long-range missiles were being stored.

The pictures were from The Islamic Revolution Guards Corps (IRGC) Aerospace Force and gave the world a look into tunnel that is about 10 meters high and houses many missiles that were sitting on their launch pads, ready to be fired. Also featured in the pictures were numerous Iranian soldiers and other pieces of hardware. The tunnel is reportedly buried 500 meters (1,640 feet) underneath a mountain, but the exact location is unknown.

The underground missile bases make it more difficult for spy satellites to pinpoint the location of the missiles and arms caches.

A senior general told state media that there were numerous missile bases scattered across the country and that all of their weapons would be getting an upgrade very soon.

“As of next year, a new and advanced generation of long-range liquid and solid fuel missiles will replace the current products,” said Brigadier General Amir Ali Hajizadeh.

“The missiles in various ranges are mounted on the launchers in all bases and (are) ready to be launched.”

The broadcast comes days after Iran tested a ballistic missile, which French and American officials are calling a violation of a U.N. Security Council resolution. The Security Council resolution 1929, which went into effect in 2010, states that Iran is banned from ballistic missile tests.

It has also been reported that Iran recently sent hundreds of troops into Syria to join their Hezbollah ally in an offensive against the rebels. The Iranian fighters have been deployed near Aleppo to retake the city with the help of Russian air strikes, rocket launchers, and artillery.