Other then the fact, it actually goes UP instead of down, it’s more of an intake rather then a outlet. But doesn’t matter though, Sylvannas had it sealed up to prevent it being used as a backdoor.
But…there’s slime in the tunnel, and no slime outside. So how can it be intaking? The slime comes from inside the city.
It is above the canals. The slime pours in from two skulls in the ceiling that I can only assume comes from the slime moat in the overcity.
Sealed up with…what power that can’t simply be undone now that they’re gone?
That slime is just polluted water, which gets polluted after it comes in.
If you notice, even those Skulls and the pipe leading into UC are WAY above everything else in the system with multiple pipes leading INTO the system.
It’s clearly designed for everything from the City above was meant to wash DOWN into the “river” flowing below.
What is now the “Back Entrance” was likely a means to “wash” the backflow DOWN, not OUT
(and as a vent pipe to let gas escape.)
Remodeling has clearly altered the perception of how the plumbing use to function but the basic layout is still observable.
It’s not “just” blocked. Where the Entrance use to be is a shear, featureless slab of stone, which means it’s not just rubble from a collapsed tunnel or a rock blocking it. That’s the work of Shamans recon structuring the very rock in the mountain.
And I doubt Sylvannas would of ordered it done without doing a very thorough job, lease the Alliance Shaman’s could just undo it again.
Not everything.
They’re above the canals in the Undercity, but they aren’t above the moat in the courtyard of the overcity.
But…it emerges from a hillside. With no water source nearby. There’s nothing to flow down.
But there’s nothing that can be done that can’t be undone. Both sides have the same powers.
Like i said, remodeling has repurposed a great deal of it’s original design.
The more I think about it, it’s primary purpose (the portion before the skulls) was likely an airvent like I said with the water draining from the Moat above being the source of the water to wash everything back down. It’s probably been widened considerably since it’s construction from it’s original purpose by the Forsaken.
But, if they’re going to do that, why not just dig an entirely new shaft, one that lead directly from the Lake to the Sewer? Much shorter distance.
Anyway, that’s way off topic.
Then they were basically too lazy to actually implement it in game and just threw in the green slime every where, which isn’t shocking.
I rewatched the cinematic and it seems that aside from the fact the Ruins were collapsing, when they watch Lordaeron from above it appears explosions are going off all around the City, even what seems gas coming from below the ground.
Since the Alliance was both outside and inside the City it’s plausible Sylvanas planned to bring the whole place, Ruins and Undercity, crashing down on her enemies.