Seems odd the virus would survive in frozen conditions!!!
Seems odder yet the “vaccine” is shipped in sub-zero conditions.
COVID-19 has been shown to be preserved very well down to -80 deg. C.
https://www.biorxiv.org/content/10.1101/2020.08.17.255166v1
However, the risk from food is thought to be low.
(Long article that winds around a lot.)
In general, cold conditions preserve viruses nicely. I don’t know what the lower limit might be and am not sure anyone has researched that, unless someone studying potential survival of viruses in cold bodies (Comet? Asteroid?) in space has looked at it.