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A study by the University of St Andrews reveals that seals' diving behavior is not triggered by carbon dioxide levels like in humans. Unlike human freedivers who risk blackouts due to high CO2, seals monitor blood oxygen levels. This allows them to control their dives and surface before oxygen depletion, preventing unconsciousness underwater. Researchers observed six grey seals in a specialized tank, manipulating oxygen and CO2 levels in their breathing air. The seals' dive duration correlated only with oxygen levels, highlighting a key difference in diving physiology between seals and humans.

Prepared by Olivia Bennett and reviewed by editorial team.