The Afghans had even dug in Mountain Towns. At Northern Afghanistan was a Centuries old underground Buddhist Monastery.
Using these Mining Tunnels we moved all over Afghanistan undetected, attacked the U.S.S.R. 40th Army, and disappeared. We also used the network of underground tunnels connecting Afghan water wells.
Later on after the 9/11 2001 as trained U.S. Army Special Forces Mountain Warfare we entered the thousands of miles of Mining Tunnels hunting the Afghan Taliban that had been the previous Pro U.S.S.R. Afghan Military (NOT our CIA Afghan Muhajeen that had become the Northern Alliance, our Allies, that helped Us Overthrow the Afghan Taliban Government, see 2018 Movie 12 Strong). While doing this we discovered the High Tech Mineral Wealth of Afghanistan.