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Q&A

What reason would a hidden, deep ocean society have to come up to the surface of a post-apocalyptic Earth and claim the land for themselves?

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This is strictly Earth based. Would it be possible for a society to develop their own civilization underwater (nothing fantastical like Aquaman or whatever, but more of a grimy, hardscrabble existence where they've developed a food chain from geothermal vents, and physiological adaptations such as biolumination, reduced vision but ability to echolocate (just brainstorming).

What reason could this society have to come up to the surface to a post-apocalyptic Earth that's been ravaged by nuclear war and bioweapons?

Perhaps they're escaping from an ancient Lovecraftian entity that's been hibernating for eons, and the explosions from the bombs awakened it? Now the underwater denizens are escaping from it?

Or maybe their food sources are running out due to widespread extinctions in the overall ocean food chain, and they're forced to come up to the surface and try their luck there, which creates a conflict with the humans living aboveground? Essentially, the nuclear warfare led to the food chain and wildlife getting screwed up, so in a nice little bit of irony, it's the surface-dweller's fault that the ocean-dwellers are coming after their land.

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This post was sourced from https://worldbuilding.stackexchange.com/q/156644. It is licensed under CC BY-SA 4.0.

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