I update the level. 
 Sorry the review crossover.
 I'll enjoy it, I'v been testvising 4 two weeks now to make it good.
 
 I couldn't stand it had a leak.
 Now it is what I was aiming at. 
 Glassy Joker!
 
 Sorry for the first file.
 
 Updated download:
 
http://members.home.nl/gimli/torment.zip
 
 The first demo's showed me a leak in the first pipe.
 This caused shooting through walls.
 Just bricking it up with an old pipe was crying for trouble.
 Mechtech helped me out by introducing func_walls which helped vis from 26 houres to 9. 
 Also added two lifts for comfortable backtracking.
 
 Thanks for the demo's, they explained a lot to me.