They're already here!

I don’t know what the hell that is, but it ain’t from this planet.

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Baby Behemoth.

After eating and growing big enough, it’ll move from underwater to land and continue its feast there, peacefully destroying the landscape.

Looks like a nudibranch of some kind, aka sea slugs. Some of them really have weird shapes, but this one looks somewhat more active than other species I’ve seen when diving.