At The Mountains of Madness - HP Lovecraft
https:// theoutline.com/post/3598/guillermo-del-toro-at-the-mountains-of-madness-revival
"In the story, an expedition to Antarctica finds an ancient, undisturbed city filled with alien life forms, suggesting a stranger precedent to humanity. The expedition goes… not well, as you might imagine. People die, and are driven insane. Horrific monsters emerge from the abyss, ready to conquer life on Earth. Is there a happy ending? Of course not!"
At this stage it is not going ahead (exept in real life?)
More on teh Lovecraft story here http:// lovecraft.wikia.com/wiki/At_the_Mountains_of_Madness