Raw multibeam bathymetry data were collected aboard RV SONNE during cruise SO305/2 (E‐POLIO‐T M2Argo‐T) using a 12kHz Kongsberg EM 122 multibeam echosounder. The expedition took place during 2024-07-16 - 2024-08-05 from Singapore (Singapore) to Port Louis (Mauritius) in the Indian Ocean. The aim of SO305/2 EPOLIO was to determine the basin wide distribution of micropollutants and first evaluation of basin wide pollution state of the surface waters and water masses in the Indian Ocean. The aim of SO305/2 M2Argo-T was to obtain high-resolution seafloor Mapping and Magnetic field characterisation of the Argo transform fault at the Central Indian Ridge.Data were recorded in the EEZ of Mauritius and outside. Sound velocity profiles (SVP) were applied on the data for calibration. Please see environmental data and the cruise report for details. The data are unprocessed and can therefore contain incorrect depth measurements (artifacts) if not further processed. Note that refraction errors may occur when no proper SVP is applied. Data acquisition was done by Leibniz Institute for Baltic Sea Research, Warnemünde and GEOMAR Helmholtz Centre for Ocean Research, provision of the data is supported by the DAM Underway Project and published according to the FAIR principles.

These data should not be used for navigational purposes.Do not misuse data for exploitation reasons (e.g. fishing).