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Anti-Torpedo Close Protection Pontoons (ATCPP), were experimental devices used for close protection of naval vessels, at anchor in Scapa Flow, from attack […]
2 x 12pdr QF guns emplaced here.
Anti-Torpedo Close Protection Pontoons (ATCPP), were experimental devices used for close protection of naval vessels, at anchor in Scapa Flow, from attack […]
2 x 12pdr QF guns emplaced here.
