CALLISTO - A Sci-Fi Psychological Horror Radio Play – Details, episodes & analysis

"I know that there is something down there beneath the surface of this moon. It’s been there billions of years, entirely alone, waiting, until we arrived - and it knows that we are here." When five astronauts are sent to one of Jupiter's moons to research its sustainability for a potential colony, they discover a mysterious signal coming from below the surface, a signal which raises the suspicion that they may not be as alone as they thought.