If those technicians and controllers had done it so often... they were handling things in very amateurish ways... and if this was set-up to please the ancients... then surely, they would've made a heck of a lot more certain of not being able to fail in any way and being more in control of what happened with the splatter fodder - especially knowing what was at stake.
Blowing the tunnel made no sense, seeing as they had done it so many times before. They would just have to open it up again for the next people to wander into their ritual killing scenario. And why was it that they didn't get the order to blow up the tunnel and that it'd come from the highest place that they shouldn't? Makes no sense if the purpose was to make sure they couldn't leave... then why was it left open and why was the technician reprimanded when he blew it up?
The high tech barrier made no sense at all. Again... if they'd done this so many times before, they should just have made "invisible" fail safe procedures to prevent anybody from leaving... and seeing as it's clearly not important for the people to be killed by the monsters of their choice, simply post snipers to take them out if they attempt crossing the gorge... or just make that gorge impossible to cross in any way, shape or form.
The chaos that ensued because a pot smoking junkie got access to some elevator controls is just rather... well... pathetic.
All in all reminded me of those small horror comic stories with the "surprising" twist that on second thought didn't make sense at all and the whole premise falls apart if you think about it even for a second.