Watch Attack of the Samurai Sharks

A 3,000-year-old skeleton originally found in the 1920s near Japan's Seto Inland Sea is covered in unusually deep cut marks. It looks like the victim of a frenzied samurai sword attack. But the skeleton, called Tsukumo 24, is from a man who died hundreds of years before the first Japanese swords were made. Now, an international team of scientists at Kyoto University reopens the case with a startling theory: Was this man killed by a shark? If so, could this be the oldest shark attack ever investigated, and which species is the prime suspect?

Attack of the Samurai Sharks is a 2026 .