A blog is a type of diary that appears on a website.

When the submersible touched the bottom, it disturbed a fish.

The bottom of the sea is covered with “chimneys” up to 20 metres high.

Thousands of crabs, mussels and fish live around the “chimneys”.

Water goes slowly down through tiny cracks in the sea bed.

The average depth of the sea is 3.86 kilometres.

They set a world record by descending 183 metres below the surface of the ocean.

Hydrothermal vents are a recent discovery that we still don't know a lot about.

When the submersible touched the bottom it disturbed a fish.

Why doesn't the sea get saltier when millions of litres of water evaporate every day?

Greetings from a research ship in the Azores.

Hydrothermal vents are a recent discovery that we still don't know a lot about.

Molten rock is rock that has become liquid because it is very hot.

Thousands of crabs, mussels and fish live around the “chimneys”.

A two-man US Navy team dived to the deepest underwater point on Earth.

I am an observer – I am here to watch what happens.

As I peered down I realised I was looking toward a world of life.

They are yellow, red, orange, green, blue – you can see why they're called rainbow vents.

Why doesn't the sea get saltier when millions of litres of water evaporate every day?

We're over 2,000 metres down now and near the sea bed.

In 1930 Charles William Beebe and Otis Barton set a world record by descending 183 metres.

Thousands of shrimps, crabs, mussels and fish live around the “chimneys”.

The room is very spacious – it can hold up to fifty people.

When the submersible touched the bottom it disturbed a fish.

A trench is a long narrow valley at the bottom of the sea.

The Mariana Trench in the western Pacific is the deepest underwater place on Earth.

What a fantastic sight! It's so unexpected.

The women's team reached the finals, while the men's team were knocked out in the first round.