The Great Bubble Barrier

The Bubble Barrier is a very creative innovation to clean the river water from plastic and debris. It is a system designed to push plastic and debris from the bottom to the surface by means of a bubble drive system that propels them to the surface and directs them into a container placed on the water surface.
A notable advantage of this innovation is that fish and banks are less damaged by shipping traffic, as the bubble screens absorb sound and waves.

https://thegreatbubblebarrier.com/en/