With sea levels rising, can humans adapt to a more watery world? The Bajau people of South-East Asia live in stilt houses and fish underwater for up to five minutes on one breath. What does this do to the body?

Take a deep breath in - how long until the urge to gasp for air becomes too much? Perhaps it comes after 30 or 40 seconds.

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I only dive once I'm totally relaxed" ...[Continue reading on BBC News]