Scientists just found the 'chemical fingerprint' of an alleged nuclear explosion that went...

Sounds like par for the course in a country without free and open media. Why take responsibility for anything when you can simply repress the news about it instead.

I'll wager that there were far more than this one that happened.
How recently this occurred is noteworthy, though.

Mayak has a history of rad/nuc incidents, dating back to 1957. Who would be surprised that the Russians would keep something like this under cover. Thanks, for the share.