In 1982, a retired British probation officer named David Martin was cleaning the chimney of his home in Bletchingley, about 20 miles south of London, during a renovation when he discovered the remains of a pigeon among the debris.

But while he was pulling out the bird’s dessicated corpse, he made a surprising discovery. As Martin told the BBC, he realized he had no ordinary bird on his hands when “down came the leg with the red capsule on with a message inside.”

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