How much glitter can a HEPA filter hold?

Expanding spray foam insulation oughta do the trick

What's your favorite idea?

Mine is being creative.

Fart

Well, the problem will be their perimeter security.

You'd essentially be treated as a VBIED, and lit the fuck up by assault rifles and/or swarms of suicide drones.

So... you could maybe attempt the 'killdozer' strategy...

Or, you could try low visibilty / high mobility.

Motorcycle, fuck maybe even an E-Bike, and hand made thermite charges.

Shitty thermite is really not that hard to make.

If you got through either AP Chem or a first year of Chem classes at Uni, and you can read the wikipedia page for thermite, you can probably figure it out. Also not that hard to figure out how to ignite it. Sparkle sparkle!

Just melt the air vents.

For further creativity, either wait for or stage nearby distractions.

And then have a very thorough plan to completely fucking vanish.

... you'd also have to, you know, gather all the required supplies for any plan, in a manner that does not raise anyone's suspicions, and probably do some tests first.

That's the nearly impossible part... you will almost certainly be unexpectedly meeting with Mr. FBI during that stage.

So you need two cement trucks.

You can also find them with ground penetrating radar since they tend to use sand as that insulating layer. From underneath they open a hatch and drain the sand out to clear the escape hatch. A big block of sand is plain and obvious to identify on a 250MHz system.

Every bunker will be built by people who won't be invited to live in it. The locations of all exits, vents, water supplies, etc. won't stay secret for very long.

That's where the bee truck comes in.

A cement truck full of cement is much easier to steal than a cement truck full of anything else.

Just set ANFOgetaboutit.

Because trapping them in is just as effective.

The tombs of the wealthy will be raided a pillaged like the tombs of the pharaohs.

Aside from being sealed by concrete and not the vault door, that pretty much is like half the vault experiments. I would even include the Gary clone vault as one. Those clones were fairly gollum like.

As is tradition.