The Challenger Deep, which is named after the British Royal Navy survey vessel HMS Challenger, has a maximum depth of approximately 10,984 meters (36,037 feet) below sea level.

A Chinese submersible has discovered thousands of worms and molluscs nearly 10 kilometres (six miles) below sea level in the ...

The BBC’s 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 ...