For the love of all things holy, do not swim with sharks to see if you can escape.
You have a better chance of being struck by lightening than being attacked by a shark. Out of the 344 species of sharks in the world, only 3 are responsible for most of the attacks on humans: Great Whites, tiger sharks and bull sharks. Great whites and tiger sharks are more common the further you venture from shore. Bull sharks, however seem to be venturing closer to shore and up estuaries even into fresh water streams that empty into the sea. The reason for this is most likely due to a depletion of food in the shark's normal hunting grounds due to the fishing industry.
Shark attacks are either the result of mistaken identity or a sharks attempt to investigate. Unfortunately a modest taste from a shark could be enough to kill a person due to blood loss and shock. If a person is violently attacked, the shark had most likely mistook them for their natural food source. Reflective jewelry or clothing can resemble the reflective skin of fish. Dangling the pale bottoms of your feet or hands in the water also resembles fish. Lying on a surfboard with your hands and feet dangling in the water resembles a fat juicy seal. Splashing in the water can emit vibrations similar to a shark feeding or a fish in distress. Bull sharks have poor eye-site and are increasingly common in warm shallow waters. These factors put Bull sharks at a higher risk for a mistaken identity attack on a person. Sharks do not actively seek people as a source of food. Even so, sharks do deserve the utmost respect. Fishing and pollution caused by man has depleted the shark's source of food, forcing them to investigate new areas in which to hunt. Unfortunately this may put them in close proximity to humans. As a result, as the human population has risen and the seas have been increasingly exploited, shark attacks although extremely rare have risen in number as well.
In addition to great whites, tigers, and bulls, there are a number of other sharks that have reportedly attacked people or boats. The metal and equipment on a boat produces a strong electromagnetic field around the boat, which can confuse a shark as they are highly sensitive to these magnetic fields. All sharks do deserve your respect as they represent the top of the food chain in the sea. Killing sharks because of recent attacks is senseless violence that rarely if ever actually kills the individual shark that was involved in the attack. A more efficient way of reducing shark attacks is by reducing the exploitation of their environment and by remembering the following guidelines when swimming:
A shark attack victim is most likely to die from blood loss or shock so quickness and controlling blood loss is key.