Run. Think. Shoot. Live. Source. Black Mesa is the Half-Life 2 total conversion of the original Half-Life game. Utilizing the Source engine and its endless array of possibilities and powers, Black Mesa will throw you into the world that started the Half-Life continuum and introduced Gordon Freeman to the world as a gun-toting, bullet-dodging Ph.D. in Theoretical Physics.
Vent Mod is an addition to Black Mesa's "We've Got Hostiles!" chapter, adding new areas to the last bits of the chapter. This mod re-adds and revamps the vent sections of the chapter, which were cut from Black Mesa due to their inadequacies.