

They do seem to become less active at night or if deprived of sunlight, and so
it may be possible they draw their primary source of energy from the sun.
[Annie refused to go
underground.](https://anime.stackexchange.com/questions/13880/how-would-
annies-going-underground-prove-anything) There also seems to be types of [wall
titans](http://shingekinokyojin.wikia.com/wiki/Wall_Titan).

It seems to me that titans are scared of underground and need of sunlight make
them weak to underground. Is this true and if so why doesn't the humans try to
colonize underground?


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attack-on-titan
Are titan's other weakness the underground?


The main weakness is the back part on the neck that what I want to say.
Underground is not exactly weakness. How I want to compare is
[Levi](http://myanimelist.net/character/45627/Levi) fighting with Titan on
plain ground without tree and building.

Why lead Titan to forest or underground ? Because they loose their power. No
The main reason is full utilization of 3D maneuver gear. They are confined and
they can't use their full potential and give benefit to Scouting Legion to use
their 3D maneuver gear.

If you read [answer](https://anime.stackexchange.com/a/13885/6345) and all the
[comment](https://anime.stackexchange.com/questions/13880/how-would-annies-
going-underground-prove-anything#comment17752_13883) you would get the
knowledge why Annie refused to go underground.

For the case of sunlight I can't confirm that sunlight give extra power or not
but night means less visibility which apply for both human and titan. In
**Chapter 38 Castle Utgard** there is night scene and Titan attack castle at
night. But in **Chapter 34 Warriors Dance** face of Titan inside wall is
covered so that daylight won't reach the titan.

> [Ymir](http://myanimelist.net/character/71479/Ymir) turn into Titan at night
> to protect her friend from other Titan and to fulfill the promised made with
> [Krista](http://myanimelist.net/character/62481/Krista_Lenz)

And for underground colonization, it is bad idea the reason is as [キルア says in
the comment](https://anime.stackexchange.com/questions/18360/are-titans-other-
weakness-the-underground#comment23384_18360).

> Would you want to live underground when a group of Titans could walk
> overhead and demolish your entire city with one jump?


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There is no evidence to suggest that being underground/confined spaces can
actually be a weakness for Titans. However there isn't any evidence supporting
the contrary as well.

A definite **strategic disadvantage** of underground transformation is obvious
(due to the restricted space for movement and the lack of visibility).

However in the corresponding chapter, you would do well to **notice** that the
Titan smashes the tunnel from outside, all too easily. So underground
colonization is a definite **NO**.

There is also no hard evidence on whether sunlight is a primary source of
power for Titans. If that were the case, then Annie's transformation in the
forest would have degenerated (no/minimal sunlight there).

Also (as suggested by
[@mirroroftruth](https://anime.stackexchange.com/a/18373/11643)), the use of
forests is mainly because of the better 3D maneuver environment. However from
my perception, undergrounds are just as _bad_ an environment for 3D maneuvers,
as they **may be** for Titans.


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I think the titans choose not to move around at night because if you read
attack on titan before the fall recent chapters you'll see how when kuklo went
to test the prototype for the 3-D maneuver gear he was still attacked by 3
titans they probably can only see when they're right on you but I think in the
dark they can actually rely on smell and hearing which is how they attacked
kuklo


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