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With the exploration of the Arctic territories, the use of ice as a construction material to build winter roads, ice crossings, airstrips, and buildings is becoming especially relevant. The main factors limiting its application are the ice matrix fragility and low strength. The introduction of modifying compounds into the ice composition makes it possible to increase its strength by more than 1.5 times. The key problem of the modified ice formation technology is the necessity to create and maintain the optimal concentration of modifiers (in the range ξmod = 150–300 ppm) in the most mechanically loaded zone of the ice block. Unlike artificial ice formed in indoor ice rinks, where crystallization front moves from bottom to top, the depth distribution of modifiers in the ice block formed under natural conditions has a fundamentally different character, the study of which is the main task of this article. For the first time, using the method of atomic emission spectroscopy the authors have obtained experimental data on the distribution diagram of modifying compounds over the depth of the ice block formed under natural cooling conditions. The cyclic nature of the experimentally obtained curve has confirmed the possibility of layer-by-layer "locking" of the introduced chemical compounds inside the ice block with heat removed to the ambient air and the crystallization front moves from top to bottom. Under these conditions, the main factors making it possible to purposefully change the concentration of the introduced modifiers in order to increase the total load-bearing capacity of the ice block can be the thickness of the filled layer and the duration of breaks between the fills. Great prospects for further research are demonstrated, taking into account the temperature conditions characteristic of the Arctic. [ABSTRACT FROM AUTHOR]