The underground facility, which joins existing storage sites in Riyadh, Jeddah and Abha, includes storage caves for gasoline, jet fuel and diesel.

The site also includes power generation, a product pumping station, lubricating oil storage and an underground control building.

Saudi Arabia’s Minister of Defence and Aviation, Crown Prince Sultan bin Abdulaziz al-Saud, said the idea for such strategic storage areas emerged about 20 years ago when foreign aircraft raided the south of the kingdom.

“This necessitated deterrents to prevent a repetition of this incident,” Crown Prince Sultan said.