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Die Churchill Barrier No 3, errichtet im 2. Weltkrieg zum Schutz des Naturhafens Scapa Flow, South Ronaldsay, Orkney, Schottland, Grossbritannien|Churchill Barrier No. 3, built during World War II to protect the natural harbour of Scapa Flow, South Ronaldsay, Orkney, Scotland, United Kingdom (KEYSTONE/imageBROKER/Peter Giovannini)