This dataset was collected during two Antarctic field seasons (2013-14, 2014-15) using the DEep LOoking Radio-Echo Sounder (DELORES), a ground-based ice-penetrating radar system that was designed and built by the British Antarctic Survey. It is an updated version of the radar used by Hindmarsh and others (2011). The system emits 2500 radio-wave pulses per second with a centre frequency of 4 MHz and samples the return at 250 MHz. Vertical resolution is approximately 30 cm. The radar is towed across the ice-sheet surface behind a skidoo at approximately 15 km h -1 and 512 complete traces are staked for each stored record, resulting in stacked traces approximately every 85 cm.

This dataset contains data from three ground-penetrating radar surveys undertaken to image ice thickness and englacial stratigraphy during the 2019-20 Antarctic field season, as part of the International Thwaites Glacier Collaboration (funded by NERC and NSF). The ground-penetrating radar data are presented as SEG-Y, along with the GPS tracks of the surveys, presented as GPS Exchange Format (GPX). The subglacial extensions of ridges of three nunataks close to Pine Island and Larter Glaciers in the Hudson Mountains region were surveyed, with the aim of determining their suitability as subglacial bedrock drill sites. Those nunataks are Winkie Nunatak (74 degrees 51'' 41.0" S/99 degrees 46'' 49.4" W), Evans Knoll (74 degrees 51'' 00.0" S/100 degrees 25'' 00.0" W), and Webber Nunatak (74 degrees 47'' 00.0" S/99 degrees 50'' 00.0" W). This work was funded by NERC grants NE/S00663X/1 and NE/S006710/1.