rotated and pulled back toward the drilling apparatus by the drive head 32 for example the drive head 32 is connected to the drill string and then a return pull stroke is initiated causing drill string to be pulled in the direction 50 as the drill string is pulled back to the drilling apparatus 20 the back reamer enlarges the previously drilled hole and the product is pulled into the enlarged hole with each pull return stroke of the drive head 32 a drill stem is removed from the ground a conventional scraper not shown can be used to remove earth residue from the drill stems as the drill stems are extracted the extracted drill stems are then uncoupled from the drill string and the drill stem transfer members 46 are used to convey the drill stems back to the magazine 26 preferably drill stem lifts 52 are used to push the drill stems from the drill stem transfer members 46 back into the magazine 26 fig2 shows one embodiment of the drilling apparatus 20 with the drill string 28 attachment constructed according to the principles of the present invention the drill string 28 comprises of multiple drill pipes or stems 40 40 u2032 40 u2033 coupled together at several points 54 54 u2032 54 u2033 and 54 u2032 u2033 generally the drill stems are threaded together a starter rod 56.