
Upon pushing the test sample into the Anti-Mass Spectrometer, a resonance cascade begins to tear away at the test chamber as both Stark and the science team begin to panic.

On the day of the incident, Stark voices his concerns over the potential safety hazards that come with pushing the Anti-Mass Spectrometer beyond its limits for the sake of experimental clarity. In an alternate timeline, Freeman bribes his former co-worker, Vincent Stark, into pretending to be him on the week of the incident, given the small resemblance between the two. After being teleported to multiple different areas on Xen, Freeman laments on the situation, referring to it as "crazy in a box with a side order of fries" before losing consciousness. The personnel overseeing the experiment are killed as beams of energy strike the room they are in, while Freeman finds himself trapped in the test chamber with no way to escape. Upon pushing the test sample into the Anti-Mass Spectrometer, a resonance cascade begins to tear away at the test chamber as both Freeman and the science team begin to panic. Gordon Freeman, the researcher who will be assisting with the experiment on the ground level, treats it as if it were any other day. In the days leading up to the Black Mesa Incident, a memo made by an employee with the initials L.M is sent to Colette Green (and cc'd to Isaac Kleiner) in which they state that, following extensive research done by Green, the sample dubbed "GG-3883" will replace the original chosen sample "EP-0021" in the coming experiment, as Green's research clarified the former's potency by way of purity. Though the expeditions would prove to be a success with several samples and extra-terrestrial life now contained in Sector E, several research members stationed on Xen would later be killed by its inhabitants.Īt some point, Black Mesa scientists discovered Race X by chance when they opened a rift to another dimension during their portal technology experiments. As the nature and location of the dimension were largely unknown, the designation "X" was used by Black Mesa to refer to the dimension and its inhabitants. One of the key sources of interest were the crystals present on the border world, dubbed "Xenium," as their unique properties would prove to be beneficial in Black Mesa's research and development of teleportation technology. The Survey Teams comb through the border world in the hopes of collecting data, flora, and even wildlife from Xen.


This border world is later referred to as "Xen."įollowing its discovery, Survey Teams are sent on science expeditions to Xen by way of a large teleportation device deep within the confines of Sector F. Sometime prior to the incident, the research team at Black Mesa discovered the alien border world in the midst of developing teleportation technology.
