The beautiful Brazilian beaches plagued by shark attacks

Lifeguards on Boa Viagem receive extra training to respond to shark attacks and are equipped with a device called the SharkShield. It emits an electric pulse through the water to shock the sharks' highly sensitive electrical receptors, which they use to find prey. Lifeguard Cabo Aquino, 38, says: "If a shark really wants to attack, this won't stop him. But if he's nearby and considering attacking, he won't want to come any closer."

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