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2km
1.2miles
none
South tunnel portal
South
West tunnel portal
West
East tunnel portal
East
North tunnel portal
North portal
Sep 2017
6
Sep 2016
5
Jan 2016
4
Feb 2013
3
May 2009
2
Oct 2006
1
  
Location of North Korea's nuclear tests[1][2]
12006; 22009; 32013; 42016-01; 52016-09; 62017;