Half-Life: F.U.B.A.R. is a mod set in the renowned Black Mesa facility. Alexander Silverstein, a 23-year-old soldier with extensive training from the United States Marine Corps, particularly in the Hazardous Environment Combat Unit , holding the rank of Sergeant, finds himself embroiled in a perilous mission to eliminate witnesses within the confines of Black Mesa. As the story unfolds, Alexander gets trapped within the labyrinthine corridors of Black Mesa, he must navigate a treacherous landscape fraught with danger and uncertainty.