Abstract: The invention represents a reversible penetrating machine with a springless pneumatically loaded differential air distributing mechanism (90) having increased efficiency, reliability, and reduced manufacturing cost and maintenance. In the new design, the role of the springs is taken over by the compressed air used in the operation of the machine. For retracting a failed machine from the hole or pushing it forward, the invention offers a machine with integrated engagement means in its front and rear parts, eliminating the need for a special engagement attachment. The invention offers a modification of the machine for special applications in which the rear valve chest with its associated parts is replaced with a flange that has appropriate air ducts. In order to decrease the lateral frictional resistance between the tubular body of the machine and the soil, the invention offers a chisel having a larger diameter than the outside diameter of said body.