Hydro-pneumatic subsoiler has got a very heavy strong structure which can reach the best performance in every soil even in combination with high power tractors. Hydro-pneumatic safety system works in extreme conditions, while in obstacle of hard, clay and stony soils. The elacticity of chassis allows overcome obstacle. The inclination of chassis is the ideal to prevent the dragging of stones on the surface and obtain an amazing penetration with the least power consumption. Shanks turn back gradually to its original working position and they have pressure resistant. In this way the machine will not be damaged.