@tollfreetoilet@Designatedkitty It is though. In HL1 the resonance cascade is triggered by a Xen crystal experiment. Xen being a dimension discovered by Black Mesa and had been under research for a period of time before the events of the game. Xen and it's boons were the boogeyman when it backfires on them.
@rwhitegoose Imagining a Train level that never ends. Countless crate rooms and suites. You expect a guard at every turn and behind every door but none appear.