A stereo pair of underwater microphones are submerged in the river relaying a hidden and otherwise imperceptible aquatic soundscape to an on-site headphone listening post, as well as online. 

The tidal mudflat zone on this section of the river Lea is a rare and threatened habitat type in the UK. These estuarine environments are critical to many species and to ecosystem functions. Aquatic species recorded at the site include shrimps, crabs, molluscs such as snails and clams, various fish including eel, grey mullet and flounder, and even mammals such as grey seals.

Freshwater bioacoustics is still an understudied field of research with some sound types you may hear remaining mysterious and often unclassified. The inevitable hum of human activity also permeates the water's surface and allows us to consider the way in which it may also be impacting this hidden soundscape.