Time series data of ocean current velocities were obtained from mooring M3 on the upper part (750 m isobath) of the continental slope, just east of the Filchner Trough in the southern Weddell Sea in February 2017 - February 2021. The mooring was deployed during the WAPITI expedition on James Clark Ross (JR16004), and recovered during the COSMUS expedition with Polarstern (PS124). The attached archive contains data from 1 RDI ADCP 75 kHz (235 mab, upwardlooking, with sampling intervall: 2h. Mooring diagrams and information about data processing are provided.