press green flag. then be patient for a couple parts.
just assume everything here is valve Half-life 1 sfx: Valve Hazardous Environments - Valve Scientist in thumbnail - Valve "The Black Mesa Incident, also referred to as the Lambda Incident, was a catastrophic event resulting from an experiment carried out by the Anomalous Materials department at the Black Mesa Research Facility. The insertion of an especially pure Xen crystal into the Anti-Mass Spectrometer triggered a rare quantum event known as a Resonance Cascade, which ruptured the space-time continuum and allowed extradimensional beings from a realm known as the Borderworld to teleport into the facility." - Half-Life Wiki
