secret tunnel
Concealed underground route
A secret tunnel is a concealed underground passage, typically built for clandestine movement—smuggling, escape, or covert access.
Secret tunnels appear in history beneath castles, prisons, and border walls, and figure prominently in adventure stories and children's play: The kids spent the summer digging a secret tunnel in the backyard.
The phrase evokes mystery and forbidden passage.
- hiddenKept out of sight
- hidden passageDisguised route between spaces
- passageSegment of text
- undergroundBelow ground or countercultural
- escapeFlight from captivity
escape route · concealed · entrance · trapdoor · trap door · smuggling · labyrinth · catacombs · darkness · excavate · crawl · bunker · hideout · hidden room · Anne Frank · mysterious · forbidden · brick
- tunnelsportal, bore, TBM, Chunnel, underground passages
- hiding placeshideout, bolthole, cubbyhole, den, hidey-hole
- secret passageshidden door, hidden panel, hidden staircase, hidden path, bookcase door
- secret stashesstash, cache, hoard, hidden compartment, stash spot
secret tunnelopen road
Unobstructed route ahead
grand entrance · main entrance · front door · public entrance · highway
secret tunnelelevated walkway
Raised path for pedestrians
skybridge · overpass · aerial tramway · skywalk · observation deck
secret, tunnel, secrets, secrete, secreted, secreting, secretion, secretive, secretively