A Chicago-sized iceberg calves from the George VI Ice Shelf—and a remote sub finds a thriving ecosystem in total darkness. Percival Blackwood follows the clues from Lake Enigma’s ancient microbes to Antarctic “pyramids,” magnetic anomalies, and the mysteries around Operation Highjump. Are we looking at legacy biota, lost history—or something off-world? Dive into the evidence, the debunkings, and the open questions in Antarctica’s most unsettling story yet.