FIELD: construction engineering. SUBSTANCE: device can be used for forming multi-component layers of ground surface and also for effective underwater laying of fiber-optical cable in summer and winter conditions. Trench-digging and cable-laying device has ground-crushing member made in the form of chain saw and provided with rod-type loosening parts and cutting parts. Rotary-action hydraulic transmission is adapted for changing cross-sectional area of throttle valve which adjusts rate of fluid flow delivered to hydraulic motor which drives ground crushing member. Installed opposite to chain saw is sprayer intended for washing-out of ground pieces from cutting parts of ground-crushing member. Application of aforesaid embodiment of device allows for enhancing trench-digging efficiency. EFFECT: higher efficiency. 3 dwg
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