It's pretty tricky to talk underwater, and so divers use a series of hand signals to communicate with one another. Try to practise these with a friend.

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Nudibranchs

Enjoy the diversity in the wonderful world of sea slugs or nudibranchs

Reef scales

From tiny polyps to hundreds of miles, discover the different scales in the coral ecosystem

Researching the reef

Find out how the XL Catlin Seaview Survey team conducted their research

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