From The TimeSplitters Wiki

Cyberden
File:Cyberden.JPG
Size	Medium
Location	Underground Hideout
Climate	N/A
Unlockable	Unlocked by Default
Recommended Bots	N/A
Recommended Weapons	N/A

Supposedly the inhabitance of the Cyborg race, Cyberden is an underground hideout with mechanical silos, fans and other industrial ware.