Low temperature permits a wider range of molecular machinery to function. For example, you could have a burrowing micro-scale machine (it doesn't need to be nano-scale, although components obviously could be) which slowly removes extracellular cryoprotectant and water, replacing it with a nontoxic cryoprotectant. The replacement matter could be laced with other helpful drugs like ischemia blockers and cell membrane fortifiers, which would activate upon warming.