I suggest 2 things:
1 - mocking the aggrieved who come to pay respects to their loved ones and think they're standing over the remains of their beloved, but might actually be standing over an empty tomb, or someone else's remains, or animal remains, etc.
2 - If the remains aren't where they're supposed to be, the likelihood that they've been desecrated in some ghoulish ritual seems pretty strong. (skull & bones, etc.)
spend a full day or so watching every Ted Gunderson video you can find on YouTube (even the ones where he's slandered and accused of being secretly evil). Many truths will be attained by that exercise. Ted was one of the first to start exposing the cabal / deep state in America. God bless that patriot, and his memory.
there used to be a show on TV (History Channel I think) called "cities of the underground" or something like that. Every episode was about the tunnels under a different city.