Understanding the Mariana Trench

Deep in the ocean is where things get really interesting. Descend to below one kilometre to the bathypelagic zone and the creatures take a weird turn, descend even further to 11 kilometres – the bottom of the Mariana Trench – and marine life becomes surreal.

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Diving in the incredible cenotes © Shutterstock

5 Incredible Cave Dives

Jill Heinerth, one of the world’s greatest cave explorers, has dived some of the world’s most testing caves. We asked her to offload five of her favourite.

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