Archaeological Assessment of Second World War Anti-Torpedo Close Protection Pontoons in Scapa Flow, Orkney

Abstract

This paper presents the outcomes of sidescan sonar and archaeological diving surveys in 2015 of two wrecked vessels located off Flotta Island, Orkney, North Scotland. Archival research indicates these are the remains of Anti-Torpedo Close Protection Pontoons (ATCPP), an experimental protection device used for close protection of naval vessels at anchor in Scapa Flow from attack by aircraft-launch torpedoes. The pontoons were only in operation in Scapa Flow for 13 months (March 1941-April 1942) and few were brought into service. As such they represent a rare heritage resource, for which very little is known about their operation.