Detecting leaks in Hammer Editor + How to make Vent Ducts / tunnels

Hi, in this video I'm going to explain to you what is the world, the void and what is, and what causes leaks. Also, I'll tell you about my newly discovered way of making the vent ducts, tunnels, metro system, whatever.

[@humhumikowy]

kozak tutorial :)

[@awesomegraczgie2131]

dzieki :D

[@Napletnik656]

Yo man I saw u playing GM9

[@bluelambda]

for me the vent opening keeps disapearing when i load the map i have made. any idea on how to fix this issue?

[@droogabooga9306]

did you guys solve it? I have the same problem