Well the thing to remember is this is an abandoned unfinished construction site so there is a highly likely chance that there is three items to create a hermetically sealed room.
Plastic sheets, ducktape and staple/nail guns with staples/nails these items are proven to create a somewhat perfect Hermetically sealed environment and if they are straight up bombs then there's a bunch of materal around that can be used to soften the blow of an explosion.
No, this is just flat out wrong. For starters, staples/nails are exactly the sort of thing you
don't want to use, because they create additional holes in the barrier. Secondly, duct tape comes loose too easily - particularly on flexible surfaces such as plastic sheeting. Thirdly, not all plastic sheeting is made equal - some of the types of plastic will work but others are permeable for entire classes of chemical, which means that whether or not any given plastic sheeting is viable (assuming you've somehow managed to magic away the first and second issues) is fundamentally a crapshoot.
"Somewhat perfect hermetically sealed environment" is an oxymoron - either it's up to CBRN standards or it's not.
So looking back over the update something caught my eye that to me makes calling for a MIC is a bad idea.
Once again if explosives you don't move them in fear of setting them off basic EOD procedure.
If these are Bio or Chem weapons then we might have a bigger problem... see these where kept under the subjects clothes' but a bio or chemical weapon on a timed delayed trigger based to go off sunlight or atmospheric conditions means that moving it to a MIC could be disastrous.
I truly believe that the best course of action is leave the pucks where they are make a ad-hoc Isolation environment and have it examined by remote control automations. This best protects our people and has the least risk to the population as a whole as what ever the pucks are can be contained to room they are in at minimum and the building as a whole.
we don't know what these highly dangerous things are and common sense says if you don't know what it is or how dangerous it is don't touch it.
Now I will say I am going to mod my plan a little to include plan AA's write in on crowd evacuation and setting up the hospital as looking at it I do believe that is actually a better write-in then mine.
Here's the thing - it's better to move them then not from a risk mitigation perspective.
This is because if they are pipe bombs, then having them go off in place means damage to an empty construction building with nobody around except law enforcement. If they're biological or chemical weapons, having them go off in an imperfectly sealed or open-air environment means fallout of some sort coming wherever is downwind (or is at risk of being downwind) of the building. One of those has a much higher degree of collateral damage than the other.
Meanwhile if the devices are moved, then if they're biological/chemical weapons than the MIL is the best possible solution, being designed for exactly this scenario. On the other hand, if they're conventional explosives, then moving them risks heavy damage to an MIL and the specialists running it. One of these is also worse than the other, but the worst likely case scenario when moving the devices is significantly less bad than the worst likely case scenario when leaving the devices in place.
Also, triggers based off of light levels would require a photovoltaic cell of some kind where it can be reached by light and would therefore be visible - and there's no way to rig a trigger for atmospheric conditions that could tell the difference between the inside of an open-air building and the outside of it, because as an open-air building it's by definition the same body of air.