Two young men entered an opening into a cavern, curious where it led. The hole didn't go very deep, but as they advanced within a few paces of a wall it disappeared from them as if stone above their feet stopped existing within the boundary of a sphere surrounding them. Puzzled, they continued. Even after walking for several minutes the stone continued to disappear around them as they progressed. But soon they noticed that stone would reappear from where it had vanished -- including in the direction they had come from. Moving toward the reappeared stone would make it vanish again. After continuing to walk for a long time, though, they noticed that moving back in the direction they'd originally begun walking from had ceased to make the stone vanish again. When they did notice this they panicked. They were more than a mile from their original entrance and had no idea how else to get out. But they had no choice except to keep walking. After some time of this, in a grim and anxious mood, they froze as they heard a noise approaching them, which in a few seconds revealed itself as an enormous monster with a long torso (thorax?) and glittering with black scales (or metal?) covering its body. Stone was vanishing from its path in the manner it had been vanishing for these men. When it saw these men it paused, then approached to get a closer look. The two were frozen in fright. The monster observed them for a few moments then retreated, and made a call. After a few moments, another of its kind appeared. The men began to feel that these monsters were happy. They were making noises. A sense of irreality set in. One of the monsters began to communicate with the men in distorted language. Establishing that they couldn't return home, it seemed to laugh and offerered to guide them out. It offered its giant hand (?) into which the men climbed, and the two monsters advanced in the direction the men had come from. Around them the stone would vanish. The monsters would move and turn and make noises in a way the men interpreted as joyful. They could move much more quickly than the men had walked or could walk, and in what seemed like only a few minutes they were back at the entrance. The monster carrying them deposited them there. The men asked if they wanted to come out with them. The monsters seemed reluctant, but communicated between themselves and then declared they would leave. The cave entrance was near a park of some kind. The exit of these creatures was visible to those in it, and they looked with concern to see these monsters. But as the monsters came toward the park its occupants became happy to see them. A family eating on a table and benches was approached by one, and felt it was asking to join the meal. They agreed to let it. The monster slid into a sitting position on the bench and was offered a share of the picnic basket, which it accepted and began to eat. The family was laughing and talking to it. Then the monster reached over to the child sitting across it and bit off his arm. The family, except for the now-crying boy, continued to laugh. In a few seconds the monster raised the child and took a leg, than another. Within a minute the entire body was eaten. The family continued to laugh. The men who had come out of the cave were watching this, dazed. And suddenly they perceived that their hair was shaved and scars ran across their heads. They remembered that in the cave more had happened to them. One had undergone surgery on his head, conscious. His mind had been changed. The other had something else happen to him. He began to remember, but it was too terrible. The dream ended.