Multibeam data were collected during R/V Polarstern cruise ARK-X/1 in Fram Strait region. Data recording was not supervised by hydrographers. Data are unprocessed and may contain outliers and blunders. Therefore the data should not directly be used for grid calculations and charting projects but need to be edited furthermore. One file contains a measurement period of one day. The dataset consists of 9 files in ATLAS ascii multibeam format (*.dux) which are compressed with GZIP to size of 39.4 MB. Atlas DUX data files can be processed using the open source software package MB-System (http://www.ldeo.columbia.edu/res/pi/MB-System/). Contact mailto:infobathy@awi.de for data access.