Nuclear activities in the Arctic

Philippe Rekacewicz, a cartographer with the UN Environmental Program, has mapped the last 50 years of nuclear activity in the Arctic (http://maps.grida.no/go/graphic/nuclear_activities_in_the_arc
tic_over_the_last_50_years):

Here's his explanatory text:

Nuclear activities in the Arctic over the last 50 years. Numerous nuclear explosions have taken place in the Arctic. One of the largest military nuclear testing facilities is on the island of Novaya Zemlya, where from 1955 through to 1990 the Soviet Union detonated 88 atmospheric, 29 underground, and 3 underwater nuclear devices. Dozens of civilian 'peaceful nuclear explosions' have also occured in the Russian Arctic, where nuclear bombs were used into the late 1980's for seismic studies, mining, and in attempts to extinguish oil-field fires.