

I saw this image on this question: [Why are there outlying towns/cities on the
walls in Shingeki no
Kyoujin?](https://anime.stackexchange.com/questions/36222/why-are-there-
outlying-towns-cities-on-the-walls-in-shingeki-no-kyoujin)

[![Shignashina
District](https://i.stack.imgur.com/bF0twl.jpg)](https://i.stack.imgur.com/bF0twl.jpg)

If you look carefully, there is a spot near the bottom where the water canal
enters the district Shignashina and then through Wall Maria itself.

Why don't the Titans use this opening to attack the city? From the question,
[Can the Titans swim?](https://anime.stackexchange.com/questions/13446/can-
the-titans-swim), there haven't been any conclusive theories as to how the
titans cross the water.

> Titans floating seems misplaced and I think "Connie's Mom" provides evidence
> that someone probably turned few people living on the islands to titans to
> wipe out humanity


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attack-on-titan
Why can't Titans attack using the canals passing through the walls?


Just a hypothesis from what has been shown in the story.

Humans has been living for 100 years in peace behind the wall. Assuming that
the gate and the canal has always looked like that during the whole 100 years,
then I suppose the main reason would be because the Titans ain't that smart.

Before the rise of the Titan Shifters, there was no accident of the wall being
breached. Only after the Titan Shifters shows up, that is the Shiganshina
attack by the Colossal Titan and Armored Titan, that the wall was finally
breached. Their method of breaching was by attacking the weak point of the
wall, the gate. Seeing that the canal allows water to flow through a gap under
the wall, then the canal should be as weak as the gate if not more. Which once
again means that the average titan just don't have the brain to think about
such a thing.

As for why Colossal Titan didn't kick the canal instead of the gate, it could
be just a coincidence, or maybe because Titans really can't swim


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If I remember correctly, the canals have some kind of blockade that can be
closed, too (correct me if I'm wrong). Breaching something is easier on land,
since moving in water slows down and thus weakens any movement.

Also, since the body temperature of titans is abnormally high, I could imagine
the water could evaporate and this would be a nuisance. If enough water is
lost this way, there would even be a considerable force of the water pushing
back to the titans - being light as they are, this could prevent them from
entering.

Remark: This is all speculation, I don't have sources for this at hand.


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They can walk through it, but probably there is some kind of metal barrier or
something that allows water but not titans. In fact, if this is true, boats
couldn't be possible and they couldn't pass, except if there it was some kind
of mechanism that allows to up or down the gate, but just a theory.


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It's kind of referenced in the anime as "the strongest part of the wall" but
not explained...

[![enter image description
here](https://i.stack.imgur.com/npbXY.png)](https://i.stack.imgur.com/npbXY.png)
[![enter image description
here](https://i.stack.imgur.com/ohu9B.png)](https://i.stack.imgur.com/ohu9B.png)

And this is where the cannon fired/transformation happened: [![enter image
description
here](https://i.stack.imgur.com/uGC5t.png)](https://i.stack.imgur.com/uGC5t.png)


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