This dataset contains timeseries from moored oceanographic instruments deployed at the HWD2 borehole site beneath the central Ross Ice Shelf. These data support studies of under-ice shelf circulation, mixing processes, and ice–ocean interactions, and they contribute to coordinated international Southern Ocean observing efforts through the Southern Ocean Observing System (SOOS).   Instruments:   - Seabird SBE37 CTDs (conductivity, temperature, pressure)   - Nortek Aquadopp current meters (u, v velocity components)    Sampling interval : 30 minutes   Location : -80.6582833, 174.4613 (WGS84 / EPSG:4326)   Deployment : Dec 2017 – August 2022 (multi-year mooring)   QC & Post-processing : The first two weeks of data were removed due to issues with the initial data transmission setup. The CTD at 416 dbar recorded anomalous conductivity and pressure values for approximately 40 days. After this period, both variables returned to within sensible ranges. Users should treat data from this interval with caution, and consider excluding or flagging these measurements in analyses. Further processing steps included corruption removal, despiking, interpolation, correcting pressure anomalies, cross-calibration, and derivation of thermodynamic variables following TEOS-10 standards. Variables - time (ISO 8601, UTC)   - longitude (degree_east)   - latitude (degree_north)   - sea_water_pressure (dbar)   - sea_water_absolute_salinity (g kg-1)   - sea_water_conservative_temperature (degree_C)   - eastward_sea_water_velocity (m s-1)   - northward_sea_water_velocity (m s-1)   Data Update Frequency never (Note: Data collection ended on 6 August 2022; no further updates are expected.)