Tyche-Heliopolis GravLoop Station

GravLoop station connecting Tyche and Heliopolis.

The Tyche-Heliopolis GravLoop Station first appears in Dark Age as a vital transit artery linking the two largest cities on Mercury. Its strategic placement makes it a linchpin for both military logistics and civilian movement, and its tunnels become the stage for one of the saga’s most brutal subterranean clashes. By the end of the novel, the station’s fate is tied to the broader war for Mercury, transforming it from a simple transport hub into a contested chokepoint whose control could decide the planet’s future.