The purpose of this survey of Loch Eriboll sea caves, undertaken on the 4th and 5th August 2015, was as a contingency while sheltering from strong winds on route to survey caves within the St. Kilda and North Rona SACs. 2 selected sea caves were surveyed using SCM methodology. These included both intertidal and subtidal components although monitoring effort was focussed on the subtidal. Detailed biological and physical surveys were conducted; the topography was mapped and the biotopes surveyed by MNCR phase 2 methodology at relocatable points along the cave system.