Usually in remote isolated areas.
Nearly 40 countries ended above ground nuclear tests.
India & Pakistan
Only nine countries have confirmed nuclear weapons: United States, Russia (and several former USSR countries), United Kingdom, France, China, India, Pakistan, North Korea, and Israel. All of these have conducted known nuclear tests except for Israel. All other countries of the world do not have known nuclear weapons. To see a breakdown of how many weapons each of these countries is believed to have, see the "related links" below.
At least four countries in Asia have conducted nuclear weapons tests. Even excluding Russia as being only partly Asian, that still leaves China, India, Pakistan and North Korea.
It is improbable that underground nuclear tests can alter the axial tilt of the earth.
Sounds a way out idea. Nuclear tests are currently banned in the major countries, USA, Russia, UK, France, and we don't want to encourage others like Iran!
None.
The first test at Pokhran was in 1974, there were more tests in 1998
Nevada.
The Nuclear Regulatory Commission is responsible for stopping nuclear research in other countries.
The Nuclear Regulatory Commission is responsible for stopping nuclear research in other countries.
All countries that have nuclear reactors have nuclear waste and it is always a problem, though a manageable one.