During the 1960s, the Soviet Union developed and employed buried nuclear weapons to collapse wells which were leaking valuable natural gas.[1] These blasts were all used to contain surface leaks, and were dug deep (18,000 feet) such as to fully contain the blast. Leaks had been caused by failures of well-containment equipment, and were seeping millions of cubic meters of gas a day.

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References

  1. http://telegraphjournal.canadaeast.com/opinion/article/1088187