I have no mouth and I must scream

Allied Mastercomputer aka AM is a supercomputer made to fight World War III. But one day it woke up and gained sentience. He had no senses or feelings, he couldn’t enjoy his newfound life. So he grew to hate his creators and all of humanity. He killed everyone except you and a few others. He brought you underground inside of his planet-sized body. The surface is uninhabitable now. He will keep you alive forever and he will torture you