I'll give you my honest take on DUMBs. I believe it is INCREDIBLY overhyped. I have been around many military bases, some of which have been mentioned in these theories, and I can tell you it's generally not near as special as people think even when they make it seem mysterious to the public.

I also have watched many DUMB videos and NONE of them have produced any significant provable theories or pictures that I can't find with a Google search.

So until someone comes out with verified evidence of all this DUMB stuff with credible witnesses I'm not buying 95% of it. It's far more likely they use subs to go to privately held islands and shit than it is to build entire underground cities that cater to elites. Sometimes you have to use logic to sift through the BS. Even with all the money in the world building tunnels to connect every country or state and to cater to less than 5000 people in the world is laughable and not even worth the effort l, much less the maintenance and coverups that would have to be involved.