tunnel networks
Subterranean connected routes
Tunnel networks are interconnected underground passages, whether naturally formed cave systems or deliberately constructed.
The term appears in military contexts for defensive fortifications and smuggling routes, in urban infrastructure for subways and utilities, and in wildlife biology for the burrows of animals like prairie dogs or ants.
The militants moved supplies through an extensive tunnel network beneath the border.
- undergroundBelow ground or countercultural
- passagesSegments or thoroughfares
- secret passagesConcealed routes through structures
- subwayUnderground transit passage
- burrowsAnimal-dug underground shelters
catacombs · warren · labyrinth · excavation · smuggling · escape · escape routes · bunkers · safe houses · moles · digging · secret · hidden · trap doors · ventilation · air shafts · mines · sewers
tunnel networksoverpasses
Elevated road crossings
skyways · elevated railways · suspension bridges · viaducts · street grids
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