The one word synonym for "underground passageway" is "tunnel".
underground railroad!
Subterranean does.
The synonym of catacombs is underground burial chambers.
alleyway, back street, lane, passageway
passage, alley, aisle, hallway, passageway
the capitol building
gangway. Also passageway, path, lane, passage, corridor, alley
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!!!!
You can find two tickets to the Underground Tour in the two trashcans to the right of the entrance (dig to the bottom). Once you have gone to the Countryside with a green balloon, you can return the tickets to their owner at the Internet Cafe on Main Street.