I have seen Signs a long time ago but I do remember the movie being unclear about the aliens' motives. Like, why did they even come to a planet full of water in the first place if it's poisonous to them? What do they get out of it?

I am fine with out of universe explanation too from interviews etc.

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    @Paulie_D one question's answer don't even touch my question and other one is answered from wikia
    – Ankit Sharma
    Jan 24, 2019 at 9:36
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    Sufficiently dense oxygen is poisonous to humans but we'd still go to an oxygenated planet. The aliens have no issue with minor water concentrations like air humidity. Their response to water is not a reason to avoid the planet altogether; it can simply be a matter of them taking precautions.
    – Flater
    Jan 24, 2019 at 10:42
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    @Flater but why they came? Colonization? experimentation? rehabilitation? sex?
    – Ankit Sharma
    Jan 24, 2019 at 10:45
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    In The Film Magazine, Joseph Wade developed the theory that Signs is not about aliens: "At all times, advances in our understanding of the events are developed by unimportant side characters providing their own point of view. Never is Shyamalan or the camera working to directly state that these invading creatures are in fact Aliens." Instead, they might be demons, defeated with holy water. Jan 24, 2019 at 13:06


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