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What is the deepest-diving mammal?

Marine mammals like whales and seals need highly specialized bodies to dive far below the waves and withstand the crushing pressure of the deep ocean, while going without oxygen for an extended period of time. But which mammal is able to dive the deepest? That title likely belongs to Cuvier's beaked whales (Ziphius cavirostris), mid-size whales that live in temperate and tropical waters around the globe.