The one word synonym for "underground passageway" is "tunnel".
The synonym of catacombs is underground burial chambers.
underground railroad!
alleyway, back street, lane, passageway
Subterranean does.
passage, alley, aisle, hallway, passageway
gangway. Also passageway, path, lane, passage, corridor, alley
The White House is connected by an underground passageway to the Eisenhower Executive Office Building (EEOB). This historic building is located next to the White House and serves as office space for many government employees and officials.
In an underground passageway that belonged to king Tut, but it was discovered later on. They also kept gold in him tomb along with him.
Mercenaries, commandos, terrorists, resistance fighters, partisans, underground fighters
That is 'passageway' .
The passageway on a boat. Duhhh!!!!
A passage through a hill is typically called a tunnel. It is an underground passageway that cuts through the hill, allowing for easier transportation or access.