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Was pushed into the stratosphere
Absorbed into atmosphere or into ground as radiation.
Sahara desert, IIRC Algeria.
All current nuclear weapons are test by simulation on petaFLOPS supercomputers at the US labs.
to test nuclear weapons
All the facilities used by the US to prepare the materials for nuclear weapons, build nuclear weapons, design and test new nuclear weapons. This is all lead by the Department Of Energy.
first USSR nuclear test
Australian Outback.
The French tested their nuclear weapons in the Sahara desert (before Algeria's independence) and on the Pacific atoll of Mururoa.
Einsteinium was discovered in 1952 in the debris from the nuclear test of Eniwetak.
Bosnia-Herzegovina has ratified the Comprehensive Nuclear Test Ban Treaty,
Bangladesh has never done any nuclear weapons tests. Pakistan and India usually test above ground to intimidate each other.