zh_biotech is a Counter Strike: Source map designed for the server side plugin 'Zombie Horde'
An experimental virus broke out deep below the city streets in a secret biotech installation. The virus has turned lab employees into mindless, brain starved "zombies" that must be stopped from spreading the infection. Eliminate the zombies or save at least 1 of the 4 surviving lab technicians.
Download the Zombie Horde plugin here (not required to the play map)