This clip shows young guys in just shorts and vests diving into a pool with sharks, and then trying to swim across as fast as possible before the shark spots them! insane. British Pathe - "'WARE SHARKS!"
It was not so long ago (15 years) that Stuart Cove and I were throwing bits of tuna meat at Rob Palmer while he swum about the water at the stern of our boat surrounded by hungry silky sharks. I wrote about it but the editor at the time refused to print it because he did not believe we did it!