From The TimeSplitters Wiki

Spaceship
Size	Medium
Location	Onboard a Spaceship
Climate	None
Unlockable	"Planet X" on Normal
Recommended Bots	N/A
Recommended Weapons	N/A

This map is a human spaceship which was attacked by the TimeSplitters. Evidences of it are the challenge 9A, where the game tells you your spaceship was attacked by TimeSplitters and the whole crew got decimated apart from you, and also the many plasma bullet holes and broken glasses you can see in the level.