in a second drill rod and with at least one transport arm that is attached to the frame and which can move a drill rod released from the drill rod assembly into a standby position in the drill rod magazine or retrieve a drill rod from its standby position and place it on the drill rod assembly according to this invention at least one component unit of the release mechanism is mounted on the transport arm application_number US 29875499 A description shown in fig1 is an earth borer system 10 according to this invention from which a drill rod 12 with a guided drill head 14 at its tip extends into a borehole 16 the subsoil 18 in fig1 is shown in cross section to illustrate the curvature of the borehole fig2 is a lateral view of a crawler mounted earth borer system 10 whose chassis 20 is provided with a support frame 22 carrying the superstructures described below at the forward end of the vehicle a cab 24 contains a control panel 26 and a seat 28 located behind the seat 26 and forming the rear wall of the cab 24 are a fuel tank 30 and a hydraulic oil tank 32 behind the rear wall of the cab is a diesel engine 34 with hydraulic system components farther back are a drilling fluid tank 36 and a mixing station 38 for the drilling fluid attached on the far side of the earth borer system 10 and sloping toward the ground is a drilling ramp 40 the bottom edge of its forward end resting on a support 42 which may be anchored in.