That blast door was a joke. After shoving a wood 2X4 through an $8K commercial blast door, they essentially built the same thing with a few extra layers of sheetmetal. I'm paying a half mill for a bunker, I want a door that weighs about a ton, is constructed of multiple layers of THICK steel, Kevlar, concrete etc. in a sandwich that will stop projectiles, blasts, and cutting torches. Of course, the smart guys just dig down to the bunker wall and cut through it, only 3/8" steel sheet. That's why I would encase everything in a couple feet of concrete before backfilling.
OTOH, the little autonomous robot that fires on anything that moves? Gimme about a dozen of those things with MAG58s attached, 1000rd belts in place.