I copied the wrong link above. This is the one I wanted to cite:
https://strangetalesweekly.com/2019/11/03/fbi-data-dump-confirms-mcmartin-tunnels/
:/
But when you read the accusations now, they appear in a different light.
hundreds of children accused teachers at the school of sexually abusing them. The accusations got more and more bizarre as kids started talking about satanic rituals, witnessing animals being mutilated, and being taken into secret underground tunnels underneath the school which lead to other places. Children named professional football players, baseball players, politicians and actors as perpetrators
I'm not saying "Strange Tales Weekly" is a convincing source, but the link to the FBI files is worth pursuing...