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How much of the ocean has been explored?

It is often claimed that we know more about the surface of the Moon than we do about the bottom of the ocean. What are we doing to learn more about our blue planet?

How the ocean works

A window into our watery world

Challenger Deep: the deepest point in the ocean

Welcome to the Hadal Zone: a place of crushing pressure, complete darkness and surprising marine life

Making Waves: Dr Dawn Wright

Oceanographer and chief scientist Dr Dawn Wright on diving to the deepest part of the ocean – and why we need to stand up for our blue planet

Coastal storms and climate change

Are hurricanes and tropical storms getting worse due to climate change – and what can be done to prepare? Professor Ilan Kelman introduces the possible scenarios

Atolls and climate change

Atolls are perceived as being most at risk from rising sea levels. Professor Ilan Kelman explores what the future could hold for these islands in the middle of the ocean

The ocean in numbers

If you're just dipping your toe in the water, here is a guide to the ocean in (increasingly large) numbers

The Challenger Expedition

The 19th-century voyage that transformed our understanding of the ocean

Witnessing the loss of an Arctic ecosystem

A rare environment. A shocking transformation. Researchers Anna Crawford and Joseph Shoapik observe the effects of the collapse of the Milne Ice Shelf