The document discusses a wave-powered device called the Wave Energized Baltic Aeration Pump (WEBAP) that is used to oxygenate deep water layers in the Baltic Sea. The three sentence summary is: The WEBAP uses wave energy to pump oxygen-rich surface water down to depths of 75-100 meters, helping to reduce low-oxygen "dead zones" in the Baltic Sea. Pilot tests found that the simple and cost-effective WEBAP was able to successfully oxygenate large areas of the seafloor and potentially bind up to 100,000 tons of phosphorus annually. Modeling indicates the technique could fully oxygenate the deep water in the Gotland Deep within five years of large-scale