The minor inflow of 20 km3, which flowed in through the Sound at the end of October and was detected at BY4 November 13, had now spread to BY5 giving oxygen concentrations just above 1 ml/l at bottom in the Bornholm Basin. However the volume is small and the oxygen content will soon be consumed. At BY4 the trend is already decreasing. In the remainder of the Baltic proper oxygen concentrations below 2 ml/l were found in the Eastern, Western and Northern Gotland Basins at depths exceeding 60 to 80 metres. Hydrogen sulphide was found from 70 metres in the Hanö Bight, from 100-125 metres in the Eastern and from 90-125 metres in the Northern and the Western Gotland Basins.