The Office of Naval Research Black Mesa research Facility (or Black Mesa for short) is a research lab based in Black Mesa, Arizona. It was established in 1942 as a nuclear research lab, but incorporated into ONR in the early 2300's. It is a major competitor of Aperture Science (especially in obtaining Forerunner artifacts) and has been a leading innovator in electronics and artificial intelligence.
Jacob Halsey: "Dammit, WHY is it so dark in here?"
Dr. Rosenberg: "It's funny to hear you bump your shins."