Site NRD-33-01A

Non- Extraterrestrial Structure/Device Site NO/533, archived as NONCOV SITE NO/533, was a -habitat built within a massive cavern on the  colony of Nordarus. It was discovered by both the Covenant and the during the Battle of Nordarus in 2533.

Description
Site NO/533 appears to be a massive resort or  habitat of some sort. It features a holographic false sky to make it seem as though it is located on rather than beneath the surface of Nordarus, and also contains an artificial "ocean".

The site lies partially beneath the human city of New Osaka.