“Anthrax spores can survive in frozen human and animal remains for hundreds of years, waiting to be released by a thaw. … The warmer climate has begun thawing the permafrost soil that covers much of Russia, including cemeteries and animal burial grounds. Thawing permafrost has also led to greater erosion of river banks where nomads often buried their dead.” (https://www.theguardian.com/world/2016/aug/01/anthrax-outbreak-climate-change-arctic-circle-russia)
Bothered? Nothing to worry about. Not like we forgot something in the deep freeze. Apart from the anthrax. And that methane that keeps bubbling up and exploding. No radioactive remnants, no, nothing like that.