A trawler exploring the deep ocean near the Cocos Islands uncovered nearly a thousand shark teeth gathered in one area of the seafloor, more than 5,000 meters below the surface. This unusual site, referred to as a "shark cemetery," was not caused by a shipwreck or ocean current but by natural geological processes. The collection includes teeth from a variety of shark species, such as great white sharks, blue sharks, tiger sharks, and even fossils of megalodon, a massive prehistoric shark that no longer exists. Remarkably, megalodon teeth were found just centimeters from those of modern great white sharks, showing how time can compress in these deep environments. The site spans 22 million years of history, with teeth from different shark lineages—some of which never coexisted in the same waters—lying side by side in the same sediment layer. Researchers noted the presence of polymetallic nodules and high concentrations of manganese, suggesting that sediment accumulates extremely slowly at this depth. This slow rate of deposition allows objects laid down millions of years apart to end up almost on top of each other, preserved in nearly perfect condition. The accumulation of teeth is due to the biological behavior of sharks, which constantly shed and replace their teeth. A single shark can lose tens of thousands of teeth over its lifetime. When multiplied by millions of years and the presence of countless sharks that have inhabited these waters over time, it results in a dense layer of teeth on the seafloor, where movement is minimal and preservation is exceptional. This discovery is part of a larger effort that has already identified nearly 150 new marine species in a region that remains largely unexplored. The Indian Ocean covers about one-fifth of the world's ocean surface, with 90% of its waters deeper than 1,000 meters. However, its deep-sea biodiversity is not as well studied as that of the Pacific and Atlantic Oceans. The polymetallic nodules found at this site are valuable for deep-sea mining, used in the production of batteries for electric vehicles and renewable energy technologies. Other research expeditions are already taking place in similar areas, such as the Coral Sea Marine Park off Australia’s northeast coast, where a German ship is mapping comparable underwater structures. The "shark cemetery" continues to reveal its secrets, with each new deep-sea trawling underscoring how much of Earth's surface remains less understood than the far side of the Moon.