secret tunnels
Concealed underground routes
Secret tunnels are concealed underground passages, typically built for clandestine movement of people or goods.
They appear in smuggling operations, prison escapes, and wartime resistance: The border patrol discovered a secret tunnel running under the fence.
In popular imagination, secret tunnels connect old mansions, castles, and churches—architectural mysteries that fuel conspiracy theories and adventure stories alike.
- undergroundBelow ground or countercultural
- passagewaysEnclosed routes between spaces
- hiddenKept out of sight
- hidden doorDisguised access point
- escapeFlight from captivity
escape route · catacombs · labyrinth · concealed · smuggling · safe house · bunker · trapdoor · darkness · torches · cobwebs · booby traps · dead end · buried treasure · forbidden · mysterious · excavation · routes
- undergroundunderground, subterranean, cave systems, underground passages, tube
- earth spiritsearth spirits, gnomes, dwarves, kobolds, knockers
secret tunnelsmain streets
Primary urban thoroughfares
public roads · public squares · boulevards · front doors · pedestrian malls
secret tunnelsskyways
Elevated enclosed passages
overpasses · observation decks · suspension bridges · sky bridges · catwalks
secret, secrets, secrete, secreted, secreting, secretion, secretive, secretively, secretiveness