Scapa Flow 2013 Marine Archaeology Survey dataset https://portal.medin.org.uk/portal/start.php?tpc=010_24643f43-0a63-3a7a-870f-648d5a0b2a7f The project consisted of remote sensing surveys and archaeological diving evaluations within the important naval harbour of Scapa Flow, Orkney commissioned by Historic Scotland. The investigations aimed to establish or confirm the identification, extent of survival, character and condition of around 25 known but mostly poorly recorded First and Second World War wreck sites and associated structures, and to ground-truth a limited sample of geophysical anomalies identified in previous studies. This work successfully documented the condition of several high priority sites within Scapa Flow and at the Churchill Barriers recording the nature and extent of the remains. The side scan and diver surveys of some of the foul ground areas around Gutter Sound identified the presence of a variety of wartime debris associated with the salvaging activities at Lyness. While it has not been possible to catalogue or provenance the artefacts identified in these area within the scope of the project, it has successfully demonstrated that the wreckage at these and other salvage sites (the SMS Seydlitz and the SMS Bayern) is extensive. In addition, the project has successfully catalogued the blockships at the Churchill Barriers, correcting a number of errors reported by previous surveys pertaining to the nature and extent of the remains and documenting that in many instances the remains are more extensive that previously noted. This has resulted in the identification of a new wreck - Clio II and confirmation that the wreckage of the Rosewood is still present. 20150417