The Secrets Kept Hidden

As far as Eli knows, only a handful of people on the Surface know about Slug Terra hidden beneath their feet. But who are they that know? And how do they know? When the Shane gang stumble across an old computer, they accidently send a message to N-tek under the code name: Will Shane8. When Fergus sends Max and Steel to check it out, they accidently bring some unwanted company.