tunnels

[lord_v]

is there a way to create a sewer system underneath the terrain.
you still need to be able to enter the sewers from outside (from the top of the terrain)

greets lord_v

[[APS]Gnat]

Not unless its a very large platform on which buildings are placed, a bit like the terraces in ArmA1.
You could make a custom terrace addon with sewers going through its middle, then place the city or trees or whatever on top of the terrace.
Either way you can not go below ground / below the terrain in ArmA

[lord_v]

mm i was already afraid of it :(
a well then we do it that way. or no sewer at all we will see :P
thanks for the fast respons