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Whales are able to
stay under by efficient use of oxygen, plus the ability to carry a relatively large amount
of oxygen on myoglobin (a muscle protien similar to hemoglobin). How deep can they go? A pilot whale can dive to 1500 feet, a sperm whale to 3000 feet.
According to Guiness Book of Records , the record belongs to the sperm whale, with
a recorded depth of 8202 ft.