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).
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).
Source: Wikipedia "Subterranean warfare" · CC BY-SA 4.0
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