I’m more interested in the ‘unpalatable’ options. Sharks have pretty bad eyesight already (I think) so making yourself invisible won’t be as much of a help. As I understand it, they are also attracted to splashing, panic, and yes, blood.
“While sharks have a number of receptors used to detect odors and weak electrical fields in the water, it is apparent from research that vision is the crucial sense in the final phase of a shark attack. By disrupting the sharks visual perception, an attack can either be diverted altogether, or at least delayed allowing time for evasive action.”
Those assholes creep up on you. I had a 10ft bull swim beneath my legs last spring, came up from behind me. Took 5 minutes to get breathing regularly.