That's Subway to Travel!

The Silly Creatures of this world are more like Fraggles than I first thought. They like to travel to-and-fro though caves in the ground. First you go down into the ground on moving Doozer-like belts called "escalators" until you find yourself in a strange cave full of Silly Creatures simply standing around. But it is not like a Fraggle cave, there are no games, no singing and no swimming. In fact, it is really quite boring. Then something terrible happens! Inside this cave there was another traveling cave that screamed as it traveled (which the Silly Creatures call a "subway") Even for a brave Fraggle like me, it was a rather terrifying experience. From now on I plan to avoid these caves at all cost.