He joined Carstens Borchgrevink's Southern Cross expedition (1898–1900) which wintered at Cape Adare, Antarctica, joining the expedition in New Zealand after the previous physicist candidate had been rejected on medical grounds.
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He was again a physicist on the Discovery expedition led by Robert Falcon Scott (1901–1904).
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Bernacchi wrote a number of books on the Antarctic including a biography of Lawrence Oates called A Very Gallant Gentleman published in 1933 and Saga of the Discovery in 1938.
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