Iran says it has an underground air force base for drones.
Iranian state television showed footage of the base for the first time on Saturday: More than a hundred "combat, reconnaissance and attack drones" are stationed at the base under the Zagros Mountains in the west of the country, it said.
State television reported on a visit by Iranian chief of staff Mohammed Bagheri and army chief Abdolrahim Musawi to the underground facility.
The exact location of the drone base was not mentioned.
The reporter said he flew there by helicopter from the city of Kermanshah for almost 40 minutes.
The base is "several hundred meters underground," Musawi said.
According to state television, the flagship of the drone fleet is the "Kaman-22", a missile-equipped drone that can fly at least 2,000 kilometers.
The United States and Israel have accused Iran of supplying drones to its Middle East allies, including the Lebanese Hizbullah militia, the government of Syrian ruler Bashar al-Assad and Yemen's Houthi rebels.
In October, the US Treasury Department imposed sanctions on the Iranian Revolutionary Guards' drone program.
Washington accused the elite force of being behind drone strikes on an oil refinery in Saudi Arabia in September 2019 and on a merchant ship off the coast of Oman, killing two crew members.
Iran denied the allegations.