Sessions 16: Criticorum. The Cage of Leviathan
Where: Criticorum System
The Tashir Station was caught in some kind of anomaly, but once the Tashir stations was destroyed, the anomaly was revealed, a planet-sized Annunaki kraken cage.
(This was a side adventure that I decided to throw in after seeing some online art that inspired me.)
Inside, the players encountered Guardians (Annunaki tech robots) and Cultists from Criticorum who were watching for this as a sign from their god.
While the cultists wanted to free the Kraken, the player sought out to stop them and re-engage the phasing technology that hid the prison from normal space.