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"  1: Neptunic Sharksuits The Neptunic Sharksuit is a type of armor invented by marine biologist Jeremiah Sullivan in the late 1970s. Since then, the steel mesh protection has been developed into a variety of forms, including soft and hard suits, for different purposes. Sullivan says that testing has proved this is &amp;quot;the only product in the world to limit if not entirely prevent injury to divers who must work in dangerous circumstances.&amp;quot; The suits are widely used by cameramen and photographers in hazardous underwater environments. The original steel mesh design, the Neptunic Classic, covers the entire body, including hands and feet. For those who do not need require a great deal of mobility, a higher level of protection is available from the Nemo II, made of a specially woven liquid-crystal polymer fiber. The Nemo II provides neutral buoyancy, but its makers warn that it makes swimming difficult. At the top of the scale for bite resistance is Neptunic HardArmor. Largely rigid, like medieval plate mail, it&amp;#039;s constructed of titanium and laminates, with steel or titanium mesh where flexibility is needed.  2: Chemical Repellent  Shark repellent has been around since World War II, when it was found that some copper compounds helped keep sharks away. However, there was little understanding of how the compounds worked. Recent research has focused on two particular areas: electropositive metals and semiochemicals.  Electropositive metals (EPMs) are alloys that slowly corrode in seawater, producing a small voltage in the process. This voltage is believed to interfere with sharks&amp;#039; electrical sense, which they use for locating prey, so they stay away. EPMs have been shown to reduce the number of sharks accidentally caught in commercial fishing.  Semiochemicals are chemical signals, produced by the one thing a shark tends to avoid: a dead shark. The SD-1 shark repellent aerosol made by SharkDefense contains a mixture of natural and synthetic repellents. The company recommends activating four 6-ounce aerosols simulataneously to create a protective zone around a person in danger. However, as its website warns, &amp;quot;No shark repellent is 100% effective.&amp;quot;  3: Electromagnetic Defense  Sharks have a sense that humans do not possess: the ability to detect electric fields, useful for finding prey when other senses are rendered useless (such as in murky water). SharkShield, a company based in South Australia, uses this sense against the shark.  Their wearable device, based on technology developed in the 1990s, uses two electrodes to create a repellent field. One battery charge lasts for about 7 hours. When a shark gets within approximately 25 feet of a SharkShield, it suffers from muscular spasms in its snout, where its electrical sense organs are located. The closer it gets, the worse the spasms, forcing the shark to flee.  SharkShield Director Rod Hartley says that the device has proved highly effective, and cites a case where the victim of an attack was actually inside the mouth of a great white. His friend swam up wearing a SharkShield, and the shark released the victim and fled. However, at least one person has reportedly been bitten (and released) while wearing a SharkShield 4: Underwater Firepower  You may prefer not to swim with sharks, but when you&amp;#039;re a member of the Spetsnaz (Russian Special Forces), you go where you&amp;#039;re told. Fortunately, you&amp;#039;re equipped for the job, with an assault rifle that works underwater as well as on the ground.  The ADS (Avtomat Dual-Medium Special) assault rifle is a development of earlier Russian weapons designed to fire underwater. Normal projectiles lose speed in water and are ineffective beyond about 10feet, no matter how great the muzzle velocity. However, as well as firing standard Russian 5.45 ammo, the ADS can also fire a dartlike bullet with a blunt nose. This produces a cavity around the projectile, reducing friction so it&amp;#039;s effective to over 80 feet at a depth of 15 feet.  The previous underwater rifle, the APS, was described by the weapon&amp;#039;s exporters as being useful against &amp;quot;dangerous sea predators&amp;quot; and mini submarines as well as enemy divers. Presumably, the ADS could be used for shark defense, although there are no recorded cases of it being employed in such a manner. 5: WASP Injector Knife  If your underwater rifle jams or the batteries in your electromagnetic repellent die, you might have to fight a shark with handheld weapons. A dive knife is standard equipment, but the WASP Injector Knife is designed to be far more effective against sharks.  Made by Wasp Injection Systems, of Hamden, Conn., the knife injects a basketball-size bubble of compressed carbon dioxide into the target at 800 psi. This approach was first adopted for anti-shark weapons used by U.S. Navy SEALs in the 1970s.   The idea is not necessarily to kill the shark, but to disturb its buoyancy so that it is forced to break off the attack. In addition, the injection of compressed gas should minimize the amount of blood in the water and reduce the chances of attracting more sharks. "^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.popularmechanics.com/technology/gear/reviews/a12407/survive-shark-attack-tech/>