Ocean

A volcanic eruption sank Aenaria nearly 2,000 years ago. Now, underwater tours and ongoing excavations are bringing Ischia's fascinating history back to the surface.

As summer warms Istanbul's waters, the megacity's authorities are having to battle a noxious algal bloom dubbed "sea snot".

Off the coast of Sicily, Sea Shepherd and its volunteers are hunting down illegal fish traps and working with Italian authorities to crack down on this environmental crime.

Two women are working to save the coral reef from the invasive lionfish, using it as a sustainable teaching tool and cooking it into everything from tacos to fish and chips.

The world's largest invertebrate remained hidden from humanity until a tantalising glimpse 100 years ago. But it would be decades before we come face to face with the colossal squid.

Once pushed to the brink of extinction by overfishing, bluefin tuna has experienced a spectacular rebound in recent years. But can it survive the onslaught of climate change?

Icebergs produce some of the loudest natural noises in the oceans. Can we learn anything about their birth, life and death by listening in?

From erecting seawalls to selling citizenship, vulnerable small islands are taking sometimes drastic measures to protect themselves from rising seas, storms and economic devastation.