Guilherme is tagging Weddell and elephant seals to obtain important information about the water in the eastern Amundsen Sea. The tags collect conductivity, temperature and depth (i.e., CTD profiles) when seals are diving, potentially in places and during periods when research may be very difficult, such as close to Thwaites Glacier during winter. With a background in veterinary medicine, ecology and statistics, Guilherme is interested in the environmental changes that are affecting Thwaites Glacier and, potentially, also affecting the animals living around in the Amundsen Sea.