MCMARTIN PRESCHOOL. Why did the Finders drop by FBI Vault include two documents related to McMartin Preschool? The documents are detailed accounts of the underground tunnels at McMartin that were later debunked. The tunnels as well as the McMartin case have nothing to do with the Finders cult. (Nothing overt that any of us know about.) So why would they be tucked into the Finders files? Is the FBI trying to tell us something? Was it a mistake?