Semipalatinsk, a top secret site that withstood 456 Soviet atomic tests: https://www.outono.net/elentir/2024/05/30/semipalatinsk-a-top-secret-site-that-withstood-456-soviet-atomic-tests/ It has been the most bombed site with nuclear weapons in the world. It's in Kazakhstan. Russia is huge, but the Kremlin didn't want to do this on Russian territory.