The hot box is a severe prison on Amana XI. Among the ammonia/ice blobs native to the planet, it is considered a kind of torture. Blobs in the hot box are subjected to temperatures so extreme that water will melt and an oxygen-enriched atmosphere.
When Space Patrol Cadet Rufus Q Shupilluliumash made insulting puns on Amana XI, he was arrested twice and was imprisoned in the hot box both times. He was confused that this prison was considered so notorious; he found it to be the most comfortable environment on the planet. His only complaint was that the food was stale.