- last post: 01.01.0001 12:00 AM PDT
In 2552, "SPARTAN-458's unit was preparing for a classified mission on Nassau Station when the ONI stealth ship Apocalypso tumbled into real-space being carried along in the wake of a freak slipspace anomaly. The anomaly intersected Nassau Station; creating a semi-stable "bubble" in the space/time continuum on its way back to the 21st Century.
Source is Halopedia .