Aquatic life in Wiels Swamp sensed by two submerged hydrophones. You can hear insects and other creatures communicating with each other, in and around the water. In the background is the ubiquitous 50 hertz, produced by the rail lines and the pipes around and around the marsh, with faint rumbles of passing trains.
>> Wiels Swamp, Forest – June 16, 2022

A short edited version:
The full recording, almost a whole hour of underwater Swamp activities can be found here.
In the framework of the Weak Signaaal worksession organized by Constant