If we had these critters in AK we'd just shoot it.
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There is another explanation for the lack of visible evidence of this strike. We know that submunitions are small, heavy, fast and hot. Also, they don't explode on contact. If they were made of something like tungsten and weighed 100 kg, they would have a volume of 5 lt. Assuming they are stretched out and pointed, their diameter would be much less than that of other missiles, as little as 20-50cm. Given the speed and momentum of these submunitions, they are likely to punch through the relatively thin industrial roofing, leaving a small, neat hole, which could be all but invisible to satellite photography.