Following the Soviet invasion in 1979, the Mujahideen defenders of Afghanistan developed and reinforced many natural cave systems to use as supply bases and defensive positions. The Taliban and Al Qaeda further developed these positions throughout the 1990s. Following the events of September 11, 2001, these cave systems have once more come to prominence and sites such as Tora Bora ("Black Dust," a series of individual caves) and Zhawar Kili (a large complex in eastern Afghanistan) have featured in news headlines around the world. This title provides a detailed analysis and visual documentation of these caves and underground systems. It also discusses the Coalition's tactical approach to dislodging the enemy from these fortified positions.