The primary aim of this benthic survey in the Sound of Barra, run by SNH and Marine Scotland Science (MSS) between 9th - 12th June 2018 using MSS vessel MRV Alba na Mara (cruise 0818A), was to refine the distribution of biotopes including Annex 1 habitats within and out with the SAC boundary using quantitative drop-down camera and grab sampling. Dropdown video drifts were undertaken at 32 stations, largely along the eastern fringe of the Sound. Through the analysis of seabed video, the images were used to describe the nature of the seabed in terms of the physical structure and the species assemblages. Runs and run segments were assessed for the presence of protected features and other PMFs, as well as for the presence of species and habitats of recognised conservation importance. Grab sampling was also undertaken on this survey at 77 sites. This data is yet to be analysed and reported.