We all have to do our part.
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Get your hands on a thermal or infrared scope to locate the bunker exhaust vent and block that up and wait for them to come out.
This is actually terrifying 💀
Pour in a 50lb bag of thermite, and drop in a burning flare.
They probably went with the cheapest contractor, which means the intake vents won't be too far away. Just one more set of holes that provide a guilt-free place to pour any kind of waste.