Board Thread:General Discussion/@comment-25028999-20150527232112/@comment-508329-20150617203905

Possibilities for the mysterious secret:
 * One of the Crystal Gems played a major role in the Kindergarten project (probably Rose Quartz).
 * Amethyst wasn't the first Kindergarten Gem they tried to save. The rest had to be bubbled after they turned into monsters.
 * The Kindergarten was designed to make gem monsters on purpose. (Maybe as cannon fodder for interstellar conquest. Maybe as power sources for magical gadgets like Lapis Lazuli's mirror.)
 * They find a new hole shaped like someone familiar. (Like Onion or Kevin.)