Astrophobia

A PSX-style cosmic horror game where a classified mission to study alien architecture on the Moon leads two astronauts into the ruins of an ancient civilization that predates humanity.

In 2001, astronauts Ben Dyer (the player) and Henry Danforth are sent to the Moon as part of a secret mission, Project Kadath, to study ancient megalithic architecture far older than humanity. The civilization that built it did not survive, but something else did.