Nearly seven kilometers beneath the Indian Ocean, a team of scientists went looking for hydrothermal vents — and found something else entirely. What they mistook, at first glance, for smoking chimneys turned out to be whale skulls: the opening of a necropolis stretching 1,200 kilometers across the sea floor, holding nearly 500 fossilized whales alongside active whale falls still teeming with life. In this episode, we sit down with Dr. Xikun Song of the Institute of Deep-Sea Science and Engineering, Chinese Academy of Sciences, one of the researchers behind this landmark discovery, newly published in Nature. Dr. Song walks us through the moment of realization on the submersible monitors, the physiology that may be driving deep-diving beaked whales to their limits, and why this site could rewrite what we know about whale evolution over the past 5.3 million years — with remains that may number in the millions, and roughly 6.7 million tons of sequestered carbon locked into the sea floor. He also shares the story in his own words — in Mandarin, with translation — describing the exact moment his team realized they’d found something extraordinary. Links mentioned in this episode:

• The full study in Nature: https://www.nature.com/articles/s41586-026-10546-z
• Smithsonian Magazine’s coverage, with photos from the dives: https://www.smithsonianmag.com/smart-news/scientists-discover-the-worlds-largest-deepest-whale-graveyard-where-cetacean-remains-have-been-piling-up-for-five-million-years-180988942/