Halkonite puzzle box

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 ==
*According to the official SJA website, the box is from a place called Halkon.SJA - Alien Objects
== Footnotes ==
Category:Sarah Jane Smith's possessions
Category:Puzzles
Category:Prisons