Multibeam echosounder (MBES) data recorded during RV MARIA S. MERIAN cruise MSM35between 20.01.2014 and 05.02.2014 in the Black Sea. The aim of the cruise was to conduct marine controlled source electromagnetic (CSEM) measurements in the Danube Delta, Black Sea, to identify suitable gas hydrate deposits for a future MEBO drilling test site for methane production and CO2 sequestration in hydrate form. 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 MSM35 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/. Due to bad weather conditions during MSM35 the quality of the bathymetric data set is between fair and poor; the ship rolled more than the system set maximum roll compensation angle. Information gathered from the CR, responsible person during this cruise / PI: Udo Barckhausen (udo.barckhausen@bgr.de). Chief Scientist: Katrin Schwalenberg (katrin.schwalenberg@bgr.de) CR: https://www.tib.eu/de/suchen/id/awi%3Adoi~10.2312%252Fcr_msm35/ CSR: https://www2.bsh.de/aktdat/dod/fahrtergebnis/2014/20140004.htm