Why Sperm Whales Collapse Their Own Lungs to Hunt
Aug 20, 2026
Somewhere in the Gulf of Alaska, satellite-tagged male sperm whales have been recorded descending to 1,848 metres and remaining submerged for 112 minutes. Those figures come from Schorr and colleagues' 2024 study in Frontiers in Marine Science — the most recent large-scale telemetry data available for the species. They aren't the routine. Most foraging dives reach 400 to 800 metres and last 30 to 50 minutes. But the physiology that makes the extremes possible is the same physiology operating on every standard dive, and it contains a paradox that takes a moment to fully register.
The sperm whale is an air-breathing mammal. Its oxygen supply is sealed inside its body at the moment it submerges. As it descends, hydrostatic pressure increases by approximately one atmosphere for every ten metres of seawater — and by Boyle's Law, gas volume shrinks in inverse proportion to pressure. At 100 metres, the lung gas is compressed to less than a tenth of its surface volume. At 1,000 metres, it's less than one percent. At the depths this animal routinely hunts, its lungs aren't functioning as gas-exchange organs. They are, in the clinical sense of the word, collapsed.
And yet the animal keeps hunting.
The answer isn't that its lungs somehow resist the pressure. They don't. The answer is that the body was built around the expectation that they wouldn't.
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Herman Melville's novel drew on the 1820 sinking of the whaleship Essex — struck and sunk by a large sperm whale — to fix this animal in culture as something beyond normal category. The biology supports the impression. Mature male sperm whales reach 16 to 18 metres and 45 to 57 tonnes. A male orca typically runs to 9 metres and 11 tonnes, giving the sperm whale a mass advantage of roughly three to five to one. Researchers who document orca attacks on sperm whale pods describe such encounters as globally rare and typically directed at calves or isolated individuals rather than large adults. One researcher quoted in ABC News coverage of a documented encounter off Western Australia in 2024 described sperm whales as "historically thought to be pretty much immune to killer whale attacks." The phrase overstates the case — attacks are documented — but the scale differential makes predation costly for the attacker.
That scale also matters for what follows. A larger body carries more oxygen reserves in absolute terms. But size alone doesn't solve the mechanics of breathing under extreme compression, and the sperm whale's solution goes well beyond simply having more room.
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