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Soviet also tried using warheads to bomb out craters to use when building dams and canal systems.
The program was put to a halt in 1988 as part of then-president Mikhail Gorbachev's nuclear disarmament initiative.
Boreholes were drilled to a depth of almost 5,000ft, and a 30-kiloton nuclear explosive was lowered into the borehole to around 115ft from the shaft of the gas well.
The bomb, an example of a peaceful nuclear explosion (PNE), was detonated in September 1966, effectively sealing the gas well shaft.
Footage shows a huge mushroom cloud forming after the underground Soviet nuke was detonated at Chagan, on the edge of the Semipalatinsk Test Site in Kazakhstan.Peaceful Nuclear Explosions (PNEs) - finding non-military uses for nuclear warheads - have been tried and tested by both the United States and Russia. Soviet began their own PNE project, the Nuclear Explosions for the National Economy, also known as Program 7, in the mid 1960s.