Multibeam echosounder (MBES) data recorded during RV MARIA S. MERIAN cruise MSM33 between 02.11.2013 and 10.11.2013 in the Black Sea. The overarching goal of MSM33 was the investigation of the biology and biogeochemistry of the central Black Sea with a special consideration of the processes at pelagic redoxicline. The bathymetric focus laid upon the slope structure especially at the Archangelsky Ridge. CI Citation: Paul Wintersteller (seafloor-imaging@marum.de) as responsible party for bathymetry raw data ingest and approval. Description of the data source: During the RV MARIA S. MERIAN cruise MSM33 the Kongsberg EM122 multibeam echosounder with a nominal sounding frequency of 11.5 to 12.5 kHz was utilized. 288 beams (and up to 864 soundings in equidistant and dual swath mode) are formed for each ping with a 2°(Tx)/2°(Rx) footprint while the seafloor is detected using amplitude and phase information for each beam sounding. For further information consult https://www.km.kongsberg.com/. Multibeam profiling during MSM33 concentrated mainly the profiling of the slope structure in different areas throughout the Black Sea. Responsible person during this cruise / PI: Helge Wolfgang Arz (helge.arz@io-warnemuende.de). Chief Scientist: Helge Wolfgang Arz (helge.arz@io-warnemuende.de). CR: https://www.tib.eu/de/suchen/id/awi%3Adoi~10.2312%252Fcr_msm33/ CSR: https://www2.bsh.de/aktdat/dod/fahrtergebnis/2013/20130056.htm