subterranean

Below ground, under the earth, underground.

Again the bearers took up the coffin, and cold and damp the subterranean air came from the opened vault. The tapers were lowered, and shed a ghastly light on the rows of piled coffins, and the moisture glittering on the walls.

And you were in the parking lot / Subterranean by your own design

Secret, concealed.

The subterranean tool of buying rigged opinion polling and media coverage is outlined in remarkable detail in chat exchanges recovered from the cellphone of one of Mr. Kurz’s closest allies and friends, Thomas Schmid.

Someone or something that is subterranean.

[H]e continues Lean like a Hawke or Heron, notwith ſtanding his devouring Appetite: yet it would ſeem that they convey that ſubſtance elſewhere, for theſe Subterraneans eat but little in their Dwellings; […]

Whatever elſe the Tauric Cimmerium have been right or wrong called, it is no leſs ſurely a capital of darkneſs, than, near the famous Baths of Baiae, in Campania, the Cimmerium, where the inhabitants were truly Cimmerian; as miners, or other ſubterraneans; who, for good or evil purpoſe, never faced the ſun.