Game stops at surtain hight?

Hey, so i was making a tunnel that goes underground, so it goes kinda underneeth the terrain but when i go to deep down in the cave the game stops?

Like if i jump of the map the game stops because im to far down or somethingā€¦
Is it possible to fix this? i mean i must be able to make tunnels right?

Thanks in advance! :smiley:

Ah never mind i found the ā€œKill Zā€ in the World Settings. i have been stuck here for a while :stuck_out_tongue:

Sry.