A drilling machine for making an excavation in ground along a substantially vertical drilling direction, the drilling machine having a bottom portion provided with cutter members and a top portion, the drilling machine presenting a longitudinal direction extending between the top portion and the bottom portion of the drilling machine, said drilling machine comprising: an anchor module having a front face and a rear face, the drilling module comprising at least one anchor device (40, 40', 140) having at least one front anchor pad (42, 42', 142) arranged on the front face and at least one rear anchor pad (44, 44', 144) arranged on the rear face, the front and rear anchor pads being deployable in a deployment direction that extends transversely to the longitudinal direction of the drilling machine so as to bear against walls (P1, P2) of the excavation in order to hold the anchor module stationary in the ground; and a drilling module carrying the cutter members 16), the drilling module cooperating with the anchor module; the anchor device (40, 40', 140) further comprises: a frame (70, 70', 170) carrying the front and rear anchor pads (42, 42', 142; 44, 44', 144), the frame (70, 70', 170) supporting the drilling module; and an actuator device (72, 72', 172) to which the front and rear anchor pads (42, 42', 142; 44, 14', 144) are fastened, the actuator device presenting a retracted state in which the front and rear anchor pads (42, 42', 142; 44, 44', 144) are retracted, and a deployed state in which the front and rear anchor pads (42, 42', 142; 44, 44', 144) are deployed, the actuator device acting on the front and rear anchor pads while being movable relative to the frame (70, 70', 170) in a movement direction that extends transversely relative to the longitudinal direction; the drilling machine being characterized in that the assembly constituted by the front anchor pad (42, 42', 142), the rear anchor pad (44, 44', 144), and the actuator device is movable relative to the frame (70, 70', 170) and to the drilling module in the movement direction. an anchor module having a front face and a rear face, the drilling module comprising at least one anchor device (40, 40', 140) having at least one front anchor pad (42, 42', 142) arranged on the front face and at least one rear anchor pad (44, 44', 144) arranged on the rear face, the front and rear anchor pads being deployable in a deployment direction that extends transversely to the longitudinal direction of the drilling machine so as to bear against walls (P1, P2) of the excavation in order to hold the anchor module stationary in the ground; and a drilling module carrying the cutter members 16), the drilling module cooperating with the anchor module; the anchor device (40, 40', 140) further comprises: a frame (70, 70', 170) carrying the front and rear anchor pads (42, 42', 142; 44, 44', 144), the frame (70, 70', 170) supporting the drilling module; and an actuator device (72, 72', 172) to which the front and rear anchor pads (42, 42', 142; 44, 14', 144) are fastened, the actuator device presenting a retracted state in which the front and rear anchor pads (42, 42', 142; 44, 44', 144) are retracted, and a deployed state in which the front and rear anchor pads (42, 42', 142; 44, 44', 144) are deployed, the actuator device acting on the front and rear anchor pads while being movable relative to the frame (70, 70', 170) in a movement direction that extends transversely relative to the longitudinal direction; a frame (70, 70', 170) carrying the front and rear anchor pads (42, 42', 142; 44, 44', 144), the frame (70, 70', 170) supporting the drilling module; and an actuator device (72, 72', 172) to which the front and rear anchor pads (42, 42', 142; 44, 14', 144) are fastened, the actuator device presenting a retracted state in which the front and rear anchor pads (42, 42', 142; 44, 44', 144) are retracted, and a deployed state in which the front and rear anchor pads (42, 42', 142; 44, 44', 144) are deployed, the actuator device acting on the front and rear anchor pads while being movable relative to the frame (70, 70', 170) in a movement direction that extends transversely relative to the longitudinal direction; the drilling machine being characterized in that the assembly constituted by the front anchor pad (42, 42', 142), the rear anchor pad (44, 44', 144), and the actuator device is movable relative to the frame (70, 70', 170) and to the drilling module in the movement direction.