YouTube star, NASA engineer and inventor Mark Rober teams up with marine biologist Luke Tipple to test the theory that sharks can smell human blood from a mile away. They get surprising results from three species of shark, using cutting-edge electronics.
After discovering that cow's blood will attract sharks in droves, Mark Rober's experiment continues with an even more real-world demonstration. To see how wild sharks will get when attracted to real human blood, the team donates their own blood.