Satellite photos published Tuesday by ImageSat International show that construction of an underground storage tunnel for missiles is underway at a Shiite militia base in northeastern Syria that was built by the Iranian Revolutionary Guard Corps.
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According to the images, the tunnel is being dug near a crossing over the Syria-Iraq border.
The Imam Ali base, where the tunnel is under construction, is the crown jewel of Iran's presence in Syria.
It allows access to a land corridor that extends from Iraq to Iran, eliminating the need for IRGC personnel to maintain air bases, which are vulnerable to Israeli strikes.
The tunnel exposed on Tuesday proves that the base is designed to accommodate advanced weapon systems that the Iranians could use in a future conflict with Israel.
Recent foreign news reports claimed that Iranian cargo planes have landed at another base in Syria, T-4. Some officials believe that those aircraft were carrying weapons shipments Tehran had deployed to the IRGC's elite Quds Force.