From The TimeSplitters Wiki

Compound
Size	Small
Location	A sort of outdoors warehouse.
Climate	TS1: Night TS2:Rain
Unlockable	"Docks" on Normal
Recommended Bots	N/A
Recommended Weapons	N/A

Compound first appeared in TS1 and reappeared in Timesplitters 2, with a visual upgrade and an added rain effect. It features a building for sniping, and a medium sized compound with stacked boxes for hiding behind. It also has a helicopter flying round the maps (TS1).