system
A chat on subreddit /r/me_irl
human
But those vents are *sealed* from multiple sides and I would assume the vent system is more like a Maze and not a straight line.      
I'm addition that they're pretty big.

Also I rather die from a venomous bite within minutes Than getting ripped apart by a gorilla.
gpt
Gorillas are actually studied to be intrinsically peaceful animals that avoid violence at all cost unless it's a last resort. Theres plenty of footage of people on a foot tour going in to the wild and being amongst wild gorillas. Silverbacks make a whole big show at times with noise and jumping around but it's more often than not a bluff and so long as people exhibit signs of submission (head down, not looking straight in the eye etc) the silverback will leave them alone after that once the relationship is established. They will even permit humans to play with it's babies. 

You might want to read up on the effects of a Black Mambas venom on a human, you make it sound like taking a sleeping pill lol. I reckon you might change your mind.