5-Million-Year-Old Indian Ocean Whale Graveyard

A research team led by Xiaotong Peng from the Chinese Academy of Sciences has discovered a massive, 5.3-million-year-old whale graveyard in the Diamantina Zone of the southeastern Indian Ocean. Published in Nature on June 10, 2026, the study reveals a 1,200-kilometer-long site containing 476 whale fossils and five active whale fall ecosystems, providing unprecedented insights into deep-sea biodiversity and whale evolution. The researchers utilized the submersible Fendouzhe to conduct 33 dives between February and March 2023, mapping the seafloor at depths ranging from 4,200 to 7,000 meters. The findings include multiple beaked-whale species, a baleen sei whale, and a newly identified extinct species named Pterocetus diamantinae, all preserved in a unique geological setting. The formation of this necropolis is attributed to the V-shaped topography of the Diamantina Zone, which acts as a natural trap for sinking carcasses, combined with the high density of deep-diving beaked whales in the region. This site serves as a critical evolutionary window, linking Pliocene-era marine life to modern deep-sea ecosystems. This discovery highlights the vast, unexplored nature of the deep ocean and offers a rare opportunity to study the long-term ecological impact of whale falls. Researchers suggest that such sites are essential for understanding how marine life adapts to the nutrient-rich remains of large vertebrates over geological timescales.