Another section is essentially a garage filled with numerous Forerunner transports and vehicles. The Citadel is an urban habitat that served as the base camp for Blue Team for the majority of their time in the shield world. There are two identified Forerunner facilities on the shield world. The exterior surface of the sphere is dark brown in color and entirely featureless, at least in the area around the only known entrance.

However, the concave curvature of the horizon can be detected with a telescopic sight. The sky inside the shield world appears solid blue the landscape on the other side of the sphere is not visible as a result of the shield world's enormous scale, unlike on smaller shield installations such as Trove.

The Dyson sphere's default environmental conditions are suitable for Earth-based life, but the climate settings could be adjusted for other species' requirements. As the Forerunners never arrived, the shield world is entirely maintained by Huragok and Sentinels, including cylindrical drones tasked with monitoring for signs of Flood infection. The observed portion of the interior surface of Sarcophagus is rolling hills and verdant forest, with several Forerunner cities in between. By April 2554, the sphere had come to house the joint UNSC- Swords of Sanghelios Onyx United Research Project and contained a growing settlement with a population in the thousands. As the human and Sangheili presence there expanded beyond what research was being conducted by ONI, 'ONIRF Trevelyan' became less associated with the shield world at large, now referring more specifically to the ONI installation on its surface.

The Office of Naval Intelligence officially designates it as ONI Research Facility Trevelyan ( ONIRF Trevelyan) in honor of the late Kurt Trevelyan. Īs Sarcophagus came to occupy the space of the former planet, the shield world is referred to as Onyx by the UNSC. It is also referred to by the Forerunners as the Sharpened Shield, and as Quarantine Safeguard. The formal designation of Sarcophagus is Shield World 006, which is sometimes rendered as Shield World 0006.

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