A short distance from the tower a subterranean passageway opened before their eyes. They descended through its murky recesses until they found the various rooms excavated in the ground.
branched off from this ditch which was the central avenue of an immense subterranean cavity. They walked… and walked. A quarter of an hour went by, a half, an entire hour.
emancipated from boss tyranny, to use his own words, and was working independently in his own home. A tiny, almost subterranean room was serving him for dwelling and workshop.
The operators next showed him the servants of these pieces, great oval cylinders extracted from subterranean storehouses called shelters.
The simple-hearted and innocent German entering therein was going to certain death. The beds were made over subterranean caves, the wardrobes were make-believe doors,
to the last detachments of the column. His wine cellars were gradually emptying. By order of dates, he continued distributing thousands of bottles stored in the subterranean parts of the castle.
This is like a vessel said the Chief after greeting them. To the two friends, these subterranean fortifications bore a certain resemblance to the lower parts of a vessel.
and he devoutly blessed the good workmanship of the castle builders. The subterranean silence began gradually to bring back his sense of hearing.
Again he answered with a subterranean murmur.
Cail was steering her along a subterranean passage lit only at distant intervals by torches.
lying beyond what is openly revealed or avowed (especially being kept in the background or deliberately concealed): covert, subterraneous, ulterior
being or operating under the surface of the earth: subsurface, subterraneous