The sea
Earth's sea covers 71 per cent of its surface and is home to almost 1 million different animal and plant species, with two thirds of them estimated to still be unknown. The sea is a large body of salt water consisting of four main areas, the Atlantic, Pacific, Indian and Artic oceans. The sea has become an important part of human life, opening doors to trade and travel , as well as being a renewable energy source.
Killer whale filmed absolutely destroying great white shark – and it has scientists worried
A gruesome discovery has challenged scientific understanding of the apex predator’s position in the food chain.
World’s weirdest: Meet the Christmas tree worm, the creature covered in feeding tentacles
Meet the bizarre underwater worm that looks like a Christmas decoration and sees through its gills.
Inside the secret deep-sea oasis where 20,000 octopuses give birth
On the side of a hill 3000m beneath the surface of the Pacific Ocean, scientists have discovered the world's biggest octopus nursery.
Blobfish: Facts about the world's ugliest animal
Learn what the blobfish really looks like – and why it’s become an unlikely poster child for marine conservation.
This adorable ‘Octopus Garden’ was discovered on deep ocean volcano
Ringo’s warm hideaway beneath the waves was real all along.
Weird animals: 25 of the most bizarre animals on Earth
From an eel that can produce 400 times their volume in slime, to a fish with human teeth, here are some really weird animals from around the world.
Megalodon: The giant ancestor of today's sharks
Huge, terrifying and now with their own movie franchise. We give you the lowdown on one of the Earth's greatest ever apex predators.
Meet the fearless scientists saving Antarctic whales… With crossbows and tiny inflatable boats
How do you study a gigantic mammal that migrates over thousands of miles and spends most of its time underwater? Here’s how the latest tech is shaping the future of whale conservation.
This bizarre four-legged whale is the new heaviest animal of all time
The findings show that gigantism is much, much older than we thought.
The secrets of the immortal jellyfish, Earth's longest-living animal
How does the immortal jellyfish (Turritopsis dohrnii) live for so long? A leading scientist explains all.
Why the next gold rush is happening at the bottom of the ocean
Inside the race to mine underwater mountains.
Controversial deep sea mining is killing ocean life, warns study
A year after deep sea mining operations, half the fish had ditched the area.
Instant Genius Podcast | The Mysteries of the Octopus, with Prof David Scheel
The staggering new science of one of Earth's strangest creatures.
Is it true that the Pacific and Atlantic Oceans don’t mix?
The two great oceans meet at very specific point on our planet.
How many continents are there in the world? It depends who you ask
There are either four, five, six, or seven continents in the world, depending on who you ask.
How deep is the ocean? Earth's staggering depth, explained
Dive into the science of Earth's murky depths.
How long does it take for a body to decompose at sea?
If you're planning a burial at sea, the rate at which your body to break down largely depends on whether you pick a tropical or temperate ocean.
Instant Genius Podcast | The hidden ways ocean currents change our world, with Helen Czerski
Take a plunge into deepest mysteries of our seas.
A real-life little mermaid would be ridiculously hairy, says science
A marine biologist reveals what a real half-human, half-fish would look like.
This cyborg fish is teaching us how your brain handles navigation
That hat though.
What is a pelican eel?
Also known as the Gulper Eel, this deep-water oddity can expand its mouth to incredible proportions, acting like a huge net to scoop up prey.
Wild Isles: How to see an orca in the UK
As seen in BBC's Wild Isles, there are killer whales in the UK. Here's where to find them and the camera equipment you'll need to take a great photograph of an orca.
How underwater cities could solve Earth's overpopulation problem
Could humans of the future actually live under the ocean? Absolutely, according to the designer of the world's first submerged city.
5 books that will change the way you look at nature
Tom Mustill shares insight from his new book, How To Speak Whale, and recommends five of his favourite books for further reading