A method and apparatus are disclosed for the formation of optical fiber structures. A mechanism for winding and unwinding the cable allows to raise and drop the measuring device within the lowermost rod, engaging it with or disengaging from a mule shoe. The output unit is configured to be connected to an external speaker and output the audio signal to the speaker. Two gate circuits are used for each line, one that controls whether voltage will pass, the other that connects the first gate circuit to a reference voltage, such as ground. Also described is a connector configured to couple the storage cell to a power source, the power source being configured to charge the storage cell, and a distribution system configured to deliver electrical current from the storage cell to the power system.