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In page Sperm whale:

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Sperm whales usually dive between 300 and 800 metres (980 and 2,620 ft), and sometimes 1 to 2 kilometres (3,300 to 6,600 ft), in search of food.[1] Such dives can last more than an hour.[1] They feed on several species, notably the giant squid, but also the colossal squid,[2] octopuses, and fish such as demersal rays and sharks,[citation needed] but their diet is mainly medium-sized squid.[3] Sperm whales may also possibly prey upon swordfish on rare occasions.[4] Some prey may be taken accidentally while eating other items.[3] Most of what is known about deep-sea squid has been learned from specimens in captured sperm whale stomachs, although more recent studies analysed faeces.