MAD-01-015 - Ienna Super-Ringworld

The Ienna Super-Ringworld, designated Ienna I, is a gargantuan ancient megastructure orbiting around an O-type star. The ring is constructed exactly 400 AU away from the star and is ten kilometers wide and five kilometers deep. The structure itself is made of an exotic metamaterial which has resisted all attempts to damage or dislodge it for further study. It is hypothesized that it is made of the same material as The Cube