Tim Peake trains for potential spacewalk in large pool

On 15 December, Tim Peake will launch into space to become Britain's first astronaut on board the International Space Station.

For the past two years, Tim has been filming video diaries for the BBC's Horizon programme, showing the risks, pressures and rigours of training.

Here the British ESA astronaut trains for a potential spacewalk on the International Space Station using a large pool at the Neutral Buoyancy Lab in Texas.