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."