Around 95% of the Earth's oceans are still unexplored - in fact, we know less about the deep sea than we do about space.
Exploring and studying the oceans is critical to protect these valuable resources for future generations.
Scientific research informs debates on issues including climate change, ocean acidification and plastics in the sea.
Uncover why we need to protect the oceans, find out how to get involved and and dive into cutting-edge research about life underwater.
Dive deeper with free events
See science in action. See experts and volunteers digitising tiny fossils and find out how you can help.
Various dates, free, drop-in
Spend an evening with our scientists and discover how marine researchers see the sea.
29 September, special event, free
In detail: our marine science
Researchers have found seven new animal species living 3,000 metres under the ocean's surface.
Body size research led by Museum palaeontologists could help predict the impact of our rapidly changing climate.
Dr Bruno Simões tells us how he pursued sea snakes from the mangroves to the open ocean to learn about their vision.