It is the far future, humans have returned to earth after taking a hiatus with the Aliens and You are one of the many research teams that go back to the oceans. You build a base and then drop it in the deep ocean, which filters in one organism at a time for research to see how far evolution has come. the first Animal you find is a Black Swallower(Chiasmodon Niger) but it's uncannily similar to a human, aside from the mermaid-like appearance and cute yet wide mouth. Your job is to study it