The Australian sea lion (Neophoca cinerea) is a benthic foraging, marine predator that breeds on about 80 islands along the coasts of South and Western Australia. The species has declined by >60% in the last 40 years and is listed as Endangered under the EPBC Act. Owing to its benthic foraging behaviour, the species remains difficult to study, and key knowledge gaps persist regarding habitat preferences, foraging behaviour and diet. Building on previous work, this study aims to advance understanding of the underwater lives of sea lions, exploring key habitats and foraging behaviours of the species. Focussing on the South Australian population, high-definition colour video cameras fitted with triaxial accelerometer/magnetometers, and GPS-linked time-depth recorders will be deployed to expand upon available data. This will allow detailed information on habitat use, predation tactics, foraging behaviours, and intra- and inter- species interactions (including with commercially targeted fish species) to be recorded. These data will improve understanding of critical foraging habitats and behaviours, supporting more effective conservation and management strategies for the species. In addition, the study will contribute to broader mapping of benthic habitats across the southern continental shelf, helping to identify areas of high ecological importance for protection and management.