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> And on top of that, the United States Air Force runs a detection network that includes satellites that can spot nuclear-weapons tests.

Always curious about this, but how do satellites detect the tests? Especially underground/water ones?

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This article explains how satellites can detect "underground" nuclear explosions http://www.earthmagazine.org/article/satellites-can-detect-u...

Thanks, that's very helpful. I've heard that the GPS system has a second function to detect nuke tests, now I see how. It can be considered a lightweight global surveillance system that gives a useful benefit when things aren't blowing up.

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