Yet, therein lies the problem. Initial testing revealed that the magnetic field only deters sharks up to around a foot away. If this is the case, people would need multiple magnets scattered across their bodies for adequate security. Also, you have to arrange the magnets with their poles facing outward because opposite poles attract. The distribution and weight of the additional metals could make it difficult to swim.
A US patent application filed in November 2007 by Eric Stroud of SharkDefense describes installing Lanthanide electropositive(带正电的) metals into scuba flippers, a bracelet and a special belt that divers or swimmers can wear to ward off sharks. According to the application, the souped-up gear would repel sharks within a few inches of approaching them Hungry sharks may power through an uncomfortable electrical field.
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