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interesting, but if you think a little deeper maybe a smaller whale would be better, the smaller the size the less to be compressed by the pressure of water
On the other hand, in humans and other land mammals, when under great pressures, when the lung squeezes the small veins (capillaries) inside it suffer ruptures and they start bleeding (called a pulmonary edema). In the marine mammals and in the, Sperm whale in particular, because the thoracic cavity is flexible, the lungs can collapse (be squeezed), without rupture of the capillaries.