Sharks are amazing, they have good eyesight, are sensitive to vibration and chemicals as well as having an amazing sense of smell/taste.
They are always hungry and if they consider you edible they will bite.
They have to keep moving to push oxygenated water through their gills so they never stop moving.
The advantage to being bitten while wearing a wetsuit is that the wetsuit will contain those bits of you not bitten away so increasing your chance of survival.
Did I mention that sharks can detect electrical activity in water ?
I took a small group of young people to a beach on the Isle of Sheppey in the Thames Estuary, the water is muddy there. One of the young people had a wee while wading in the sea (no one else about for miles), a few seconds later a 6' blue fin shark popped out of the water to have a look around close to them. I was impressed at the speed at which the young people were able to cross the sand back to the beach, they never thought that sharks can't swim on sand when the tide is out or that blue fin sharks are harmless.
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