I don't think its fake. Remember, we over engineer the shit out of everything by default. I even do it and I don't know Im doing it.
Betting this was the end result of building in drainage and air vents that were connected within the wall to allow for positive air flow in case it needed to move a ton of water and not become bogged down due to zero pressure/being full of water.
With that said, I would totally have stood there telling you about the genius level shit I designed on how to kill everyone trying to put a grenade in there.