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Nothing seems to be out of place, except a chemical leak that forces the tram to momentarily stop.
A man in a dark suit is seen watching Gordon from another tram, later to be known as the G-Man.
After donning his HEV Suit, he proceeds to the Test Chamber, containing a large Anti-Mass Spectrometer.
Here, Gordon encounters a deadly new foe, the Tentacles.This opens an inter-dimensional portal between Earth and a bizarre alien world known as Xen.Gordon is briefly teleported there during the ordeal, at one point encountering what appear to be sentient life forms, including Vortigaunts. This chapter details Gordon's efforts to reach the surface to get help in the aftermath of the Resonance Cascade.This chapter is the training segment of Half-Life and takes place in the Black Mesa Hazard Course, a Training Facility.It teaches the player how to use the HEV Suit, how to move around and interact with the environment, how to use weapons, and how to use the Long Jump Module.