"DEMETE', the Lost city on the exoplanet TRAPPIST-1 F - Illustration - Alien city Concept art

Buried beneath the eternal ice of TRAPPIST-1f, lay Demete, a forgotten metropolis. A lone scout ship, scanning the desolate exoplanet, picked up a faint, rhythmic pulse emanating from the depths – a whisper from a civilization long entombed.
The explorers descended, eager to unearth the secrets of Demete's frozen silence.