How deep can narwhals dive?
As deep-diving cetaceans, narwhals are fully equipped to sustain long periods without oxygen in a high-pressure environment. They have been known to dive to 1,500 metres deep, with dives lasting 25 to 30 minutes. Their blood and muscles can hold more oxygen than most mammals, even many other whales, and they rely on their high number of blood vessels between their heart and lungs.
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