Major oil spills can be catastrophic for seabirds and marine life. Nearly 15 years on from the biggest marine spill in history, are we any better at cleaning up oil at sea?

Antarctica's remote and mysterious current has a profound influence on the climate, food systems and Antarctic ecosystems. Can we stop it weakening by 2050?

The world's frozen oceans keep the planet cool, but they currently have less ice than ever recorded before.

In January 1997, British sailor Tony Bullimore was trapped for four days in an upturned yacht that was filling up with "bitterly cold" water in the Southern Ocean.

Equatic is among a wave of start-ups exploring how the ocean could be harnessed to capture and store carbon. But not everyone is sure it's such a good idea.

Global temperatures rose and extreme weather ramped up, but there were also some significant breakthroughs for the climate this year.

The world's biggest iceberg is drifting towards the Atlantic Ocean after being stuck near Antarctica.

Humpback whales have been making a conservation comeback – but warming seas are putting their recovery at risk.