Why is most of the ocean still unexplored? - What in the World podcast, BBC World Service

Oceans make up more than 99% of the Earth’s habitats by volume, yet less than 20% of them have been explored.

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Some say it’s easier to send astronauts into space than it is to reach the ocean floor. Only a handful of people have ever reached the deepest part of the ocean - known as the Challenger Deep in the Mariana Trench in the Pacific Ocean.

Why is it so difficult to get there? And what new tech is helping us uncover the ocean’s secrets?

BBC Climate and Science correspondent Georgina Rannard explains why we know so little about what’s going on in the deepest parts of the ocean and some of the discoveries that have been made about this mysterious part of our world.

00:00 Coming up
00:14 Intro
1:28 How oceans provide us oxygen
2:30 Why we don’t know much about the ocean
3:40 The deepest point of the ocean
4:00 Exploring the Mariana trench
5:05 Discoveries in the Mariana trench
5:55 Submarine capabilites
7:20 What is dark oxygen?
9:10 Recently discovered animals
9:44 Why deep ocean creatures look ‘weird’
11:14 What’s the point of the research?

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Thumbnail credit: Australian Museum

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Presenter: William Lee Adams
Producers: Baldeep Chahal, Julia Ross-Roy and Emilia Jansson
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