This British Geological Survey (BGS) marine geophysical survey took place in July 2013 approx 15km east of the island of Mingulay on board the RV Calanus. The purpose was to obtain seismic profiles across the coral mounds of the Mingulay Coldwater Coral Reef. An additional line was collected in Sound of Mull as a test. It has provided useful information on a submarine landslide. Sub bottom seismic profiling data were gathered by BGS using an Applied Acoustics surface tow boomer (S-Boom). These data are archived by BGS. Technical details of the survey are contained in BGS Report OR/13/033. GeoIndex Offshore - https://mapapps2.bgs.ac.uk/geoindex_offshore/home.html?cruise=2013/7&;.