A massive solar energy facility operates deep within Mercury's crust, beaming power back to sustain Earth's growing civilization. The Saint Elmo plant represents humanity's boldest technological achievement: a monument to our ability to harness the sun itself. Then everything goes wrong. Communication breaks down. Systems fail in ways that shouldn't be possible. Earth dispatches a team of engineers to investigate, but the closer they get to the plant's core, the more the disaster reveals itself as something far stranger than mechanical failure. Mercury's inhospitable environment becomes the least of their concerns when they discover what's really happening inside the facility. This 1987 special trades spectacle for tension, building dread through isolation and technical mystery. It captures that specific sci-fi anxiety about humanity pushing too far, too fast into environments we barely understand. The stakes feel personal because they're grounded in the immediate survival of a small crew trapped millions of kilometers from home, forced to confront both their equipment's limitations and their own.