Metro Last Light Redux: DLC Missions - Spider Lair
A young Stalker sitting with two companions, Simon and Petrovich, in a Venice bar discuss the location of another bunker complex similar to D6 not marked on any maps. Awakening two days later, the young Stalker finds himself trapped upside-down in a Spiderbug webbing among many corpses. After freeing himself he finds both his companions are dead. After ascending through the facility he finally manages to escape through an elevator, just to find himself in peril again.
Unfortunately I cut the video too soon, at the end after the white flash the young Stalker emerges into the ruins of apocalyptic Moscow, after surviving a spider infested missile silo base, demons and watchmen are waiting for him at the surface, the cutscene ends with a watchmen jumping for the young Stalker, which I didn't include and I'm sorry. The young Stalker's fate is unknown, but with the odds he was facing he is presumed dead.