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Halkonite puzzle boxes were made from Halkonite steel. They were impenetrable. Nothing could escape them, not even thoughts.
In the 2000s, Sarah Jane Smith used a box made of Halkonite steel to contain a fragment of the Weserbergland meteorite where the Pied Piper had been trapped. (TV: The Day of the Clown)
Behind the scenes[[edit] | [edit source]]
- According to the official SJA website, the box is from a place called Halkon.[1]