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This animal… disappears underwater… for hours. No breathing. No surfacing. Just gone. Then suddenly… it returns. This is Cuvier’s beaked whale. And it can stay underwater for over two hours. Diving deeper than almost any mammal. So how does it survive? It slows everything down. Heart rate drops. Oxygen is stored in blood and muscle. Used only where needed. Nothing wasted. Its body compresses… adapting to crushing pressure. While hunting in darkness… it searches for prey below