Subterraneous

During the reigns of Charles II., and James, his successor, the principal nobility held frequent meetings in a subterraneous vault beneath this house, for the purpose of ascertaining the measures necessary to be pursued for reestablishing the liberties of the kingdom, which the insidious hypocrisy of one monarch, and the more avowed despotism of the other, had completely undermined and destroyed.

The atmosphere is supposed to extend itself about five miles round this globe of earth, and within that space move all kind of vapours exhaled by the sun's force, or protruded by the subterraneous heat.

[S]he recollected a ſubterraneous paſſage which led from the vaults of the caſtle to the church of St. Nicholas.

The Indians of the Orellanna, also, tell of horrible noises heard occasionally in the Paraguaxo, […] Others have endeavored to account for these discharges of "mountain artillery" on humbler principles; attributing them […] to the disengagement of hydrogen, produced by subterraneous beds of coal in a state of ignition.

A low rumbling sound was heard; a subterraneous hum; and then all held their breaths; as bedraggled with trailing ropes, and harpoons, and lances, a vast form shot lengthwise, but obliquely from the sea.

The 3-mile underground railway—or "subterraneous wagonway"—was begun about 1770 by Christopher Bedlington, and was therefore commonly known as Kitty's Drift.