How are they trapped in the spiderhead?

While reading the story “Escape from spiderhead” I was truly shocked while reading the story. The whole idea that they were stuck in a science experiment because they were criminals or did wrong in their life was interesting. For example, Jeff was a criminal and he told the story about his crime ” Nearby was a brick. I grabbed it, glanced Mike in the head with it”(77). We also never knew exactly what were all the crimes each person committed. There were a lot of questions about the story that we did not get the answer too. Like how long they would be in this experiment ? Does jail even exist anymore? But having all these unanswered questions made you think about the story more when you were done reading the story. But I love a good ending where all the ties are wrapped together and I get all my questions answered.