Hey,
Thank you very much x-M-x, yes there are plenty of holes in the map for now.
Since the segment is not yet integrated to the whole gigantic map I won't bother fixing them because it's likely to get worse after.
I'll do poly debugging once both map are merged but thanks for the feedback.
Did you get a sense of Chaos with the AI Alien? I tried to randomize a lot their spawning (either ahead or behind).
If you're lucky, one alien will spawn per trigger.
If you're unlucky, many Aliens will spawn per trigger