Watch: How HSBC brought China's Yangtze river to Gatwick

Visitors passing through Gatwick Airport might hear the sounds of farmers, tractors, birds, or fishermen emptying their nets.

It’s all part of HSBC’s sound installation on the airport’s 194-metre sky bridge, which mimics the Yangtze river in China.

J Walter Thompson London created the work as part of a conservation campaign with the World Wildlife Fund.

The project entails 28 kilometres of speaker cable, 160 speakers, and 80 channels of independent sound, according to Nick Ryan, a Bafta-award winning sound designer who worked with JWT to create the project.

Chris Clark, the group head of marketing at HSBC, said: "The water programme is a big one for us. We felt over the years that it’s been something our people are very proud of.

"This was a chance to use a little bit of space and a little bit of creativity to bring that whole commitment to the Yangtze river to life."