Subterranean warfare

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Subterranean warfare or underground warfare is warfare conducted underneath the ground surface. It is predominantly conducted in tunnels and underground cavities, both natural (such as caves) and artificial (such as sewerage and subway systems).

Underground military facilities play a key role in many nations, and there are more than 10,000 underground military facilities worldwide. As such, underground warfare is a nearly inevitable component of modern conflicts.^[1]

Combatants often go underground to counteract overmatch such as that faced when taking on a superpower. Underground environments generally protect from surface attacks and aerial attacks such as airstrikes and artillery barrages, and are also generally dark, enclosed, and well-protected, making them difficult for even experienced forces to effectively fight in.^[2]