Could pumping oxygen into the Baltic, as if it were a giant fishtank, inject life into a lifeless seabed? This is the question a pilot study being carried out by researchers based at the University of Gothenburg, Sweden, hopes to answer. The Baltic Sea currently has an unusually high phosphate content and produces considerable algal blooms during the summer. Pumping in oxygen could, however, help the environment revert to conditions last seen in the 1990s. "We are going to investigate how you succeed in retaining the phosphorus in the bottom sediment under different external circumstances, with and without artificial oxygenation, in two coastal basins", says project director Anders Stigebrandt.