Story: Orion is the facility that formaly was known as BlackMesa. It started up again 3 years after the incident... Singleplayer mod for Half-Life, be sure to check our website and forums!
Short, but sweet :)
I have to say, the level design was marvelous. I was disappointed by the overall length, but like Captain B.O said, there's alot condensed into this little mod :>