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Scapa Flow

Scottish naval base where scuttled WWI warships became a source of low-background steel

Scapa Flow is a natural harbor in the Orkney Islands, Scotland, where the German High Seas Fleet was scuttled on June 21, 1919, following World War I. Seventy-four warships sank that day, and their steel—manufactured before the nuclear age—later became the world's premier source of low-background steel.

The steel's value was not apparent until decades after the scuttling. Once atmospheric nuclear testing began in 1945 and contaminated global steel production with radioactive isotopes, pre-war steel became essential for building radiation-sensitive equipment. The Scapa Flow wrecks, protected underwater from fallout, contained thousands of tons of uncontaminated metal.

Salvage operations have extracted steel for Geiger counters, whole-body medical scanners, particle physics experiments, and reportedly NASA's Voyager probes. The irony is precise: ships built for one war became valuable because of weapons developed in the next.

Today Scapa Flow represents a finite, depleting resource. As a pre-contamination resource, its steel cannot be replaced—only exhausted.

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