A 400-year-old secret unlocked: CT scans crack the four-letter code on a brass lock recovered from a shipwreck off the coast of Wales in 1583

Daily Mail - Nov 5, 2026

For 400 years, this brass padlock has remained firmly sealed at the bottom of the sea. But scientists have finally cracked its code, solving the four-letter sequence that has kept it locked since 1583.

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