Haeundae Beach in Busan, one of Korea’s most famous summer vacation destinations, will use a device to drive away sharks, for the first time in Korea. A shark catches preys by feeling a weak electric current from them. The device emits a very strong electric pulse to disorientate sharks. The 950-gram device from Australia can be attached to scuba diving gear apparatus, jet skis or buoys. With batteries the device gives out electric pulses with about a 5-meter radius for six to seven hours, and can be used up to 45 meters below sea level. The measure comes after the National Fisheries Research and Development Institute warned of great white sharks off the coast here between May and September when the warm current flows to the Korean Peninsula.