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The 10-year plan for the reconstruction of Moscow calls for extensive ground work such as the excavation of foundation pits, trenches for the construction of buildings, and underground installations. Various mechanical methods for working frozen ground are used in Moscow, the most noteworthy being blasting, mechanical crushing by means of wedge-shaped strikers, and soil thawing with warm water (water needles) and tubular electric heaters (electric needles). Despite the simplicity and low cost of this method, its application in cities is limited because of the safety hazard to the inhabitants and structures in the vicinity of the blasting site. However, present techniques of blasting have been perfected to such an extent that the danger to population and buildings is reduced to the minimum. Nevertheless, it would be desirable to simplify procedures still more and to further extend the limits imposed on blasting. (Author).