They could do that, but it's far more likely to be just dry ice. -80 being a class of freezers is a thing because that's what dry ice can provide. -80 transpor

They could do that, but it's far more likely to be just dry ice. -80 being a class of freezers is a thing because that's what dry ice can provide. -80 transport often consists of good insulation and a good chunk of dry ice instead of active measures.