One embodiment is an earth penetrating apparatus with foldable, lockable wings. The apparatus includes a frame consisting of a tube (1), fixed steering fins (2) and fastening plates (7). Wings consisting of a reinforcement (9) and a blade (12) are attached to the fastening plates (7) with a bolt (10) and nut (1 1) to create a hinge joint, making the wings foldable. A locking- and wedge-piece (14) attached to a rod (15) is placed inside the frame tube (1 ), and an end cap (17) is fitted to the upper end of the frame tube (1). The rod (15) and end cap (17) are locked together by a nut (18) and a key- wedge (19), creating a wing locking mechanism. The wing locking mechanism is released by removing the nut (18) and replacing the end cap (17) with a hit cap (20). When deployed in a horizontal position the wings provide a large area that resists sinkage.
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