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> The ‘colony’ has evidently produced no offspring, which is due to low (though relatively stable) temperatures and scanty food in the bunker.

Isn't it due to the lack of the queen? Colony of worker ants is a dead end

They mentioned that a queen or brood ant might fall into the bunker occasionally but the low temperatures would prevent breeding in that case.

I think some acrobat ant colonies have more than one queen.