Why haven't scientists seen a living Megalodon shark?

Scientists haven't seen a living Megalodon shark because this species, which lived approximately 2.6 million years ago, is believed to be extinct. The Megalodon was a massive predator, but changes in oceanic conditions, prey availability, and competition likely contributed to its decline. Additionally, the vastness of the ocean and the challenges of deep-sea exploration make it unlikely for any surviving individuals to be detected, even if they existed.