It’s a work of fiction, but thanks for pointing it out.
https://en.wikipedia.org/wiki/The_HAB_Theory
Civ,
I never heard of the HAB - I only pointed out (before the mention of the HAB) that to my knowledge the last time Antarctic coast was ice free was around 14 million years ago - a statement to which no one replied. I have recently read that some think the coast (or parts of it) might have been ice free as recently as 1 million years ago.
How did those maps come into existence? We will likely never know the origins that were likely lost in the Great Lisbon Quake in the 18th Century which destroyed the library where the Portuguese kept all their secret maps ... and perhaps the original sources of the maps we have today.