There's an H.P. Lovecraft story about that: At the Mountains of Madness. Although, back in his day they thought that Antarctica already had a giant inland sea.

There's an H.P. Lovecraft story about that: At the Mountains of Madness. Although, back in his day they thought that Antarctica already had a giant inland sea. Jules Verne also wrote about the idea in some of his stories. It's hard to imagine these days, but there used to be parts of the earth's surface that nobody had ever surveyed in fairly contemporary times.