Surface water temperatures were normal throughout the investigated area. Surface nutrient concentrations were mostly normal. Oxygen concentrations below 2 ml/l were observed at depths exceeding 60 to 80 metres throughout the Baltic Proper and from 40 metres in the eastern part of the Arkona Basin. In the bottom water of the sound oxygen concentration was 2 ml/l. In the bottom water of south-eastern Kattegat the oxygen deficiency for this year is over and the lowest recording made was 4.2 ml/l. The oxygen content at the bottom in the south-eastern Skagerrak was below normal but at the level 4.7 ml/l. Hydrogen sulphide was found at bottom in the Bornholm Basin where bottom depths exceeded 70 to 85 metres and in large volumes north, west and east of Gotland. In the northern and western Gotland Basins the oxygen/hydrogen sulphide conditions were as bad as last year.