The main problem is see here is cooling. It will require energy and that might be a problem with earth quakes or attacks by North Korea. In that respect Svalba

The main problem is see here is cooling. It will require energy and that might be a problem with earth quakes or attacks by North Korea. In that respect Svalbard appears to be a better location (although they are having some problems due to global warming [0]). [0] https://www.theguardian.com/environment/2017/may/19/arctic-stronghold-of-worlds-seeds-flooded-after-permafrost-melts https://www.theguardian.com/environment/2017/may/19/arctic-s...