entrance tunnel
Way in underground
An entrance tunnel is a passage that provides access into a larger space—a mine, burrow, underground structure, or enclosed area.
The term emphasizes the tunnel's function as a point of entry rather than a thoroughfare: The badger's sett had multiple entrance tunnels.
In architecture and engineering, entrance tunnels often serve as transitional spaces between outside and inside environments.
- passagewayEnclosed route between spaces
- secret passageConcealed route through structure
- gatewayPoint of access
- portalImposing entrance or gate
- thresholdPoint of beginning
underground · burrow · opening · subway · mine · mine shaft · shaft · corridor · darkness · excavation · rabbit hole · rabbit warren · descent · emerge · bore · crawl · echo · damp
entrance tunnelexit route
Designated departure path
escape tunnel · way out · escape route · exit ramp · emergency exit
entrance, tunnel, enter, entry, entered, entering, enters, entrant, reenter