The Sea Girl is a 1930 lost world novel by Ray Cummings dealing with a lost world in the deeps of the ocean. As a bonus, there are mermaids. Of a sort. There's also a beautiful but evil undersea empress and atomic submarines. A fine adventure.

My review: https://vintagepopfictions.blogspot.com/2023/09/ray-cummings-sea-girl.html

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