From Halopedia, the Halo wiki
Skycrypts consist of a small, circular building located atop a long, thin pole or chain. Four fin-like structures slowly rotate around the pole directly beneath the main chamber. Given the central pole's apparent lack of structural support, the spires may employ anti-gravity technology to remain aloft.
Skycrypts were generally suspended above ice worlds, and considered virtually inescapable to their detainees. However, they offer little defence against external threats. At least fourteen of these structures were located on an unidentified, icy world - with at least one housing an unidentified occupant suffering a containment failure.
List of appearances
- Halo Encyclopedia (2022 edition), page 327
- Halo: Reach, multiplayer map Solitary
- Xbox Wire, News from Halo Fest: "These spinning confinement platforms are a testament to the technological prowess of the Forerunners. In the event of a security breach, the facility’s suborbital location and frigid temperature were thought to be able to keep any threat at bay, but it appears those plans were… optimistic." (Retrieved on Sep 21, 2022) [archive]
- Halo Waypoint - News, The Halo Bulletin: 11.9.11 (Retrieved on Apr 30, 2013) [archive]