Abstract: The invention relates to apparatus for extracting a substance stored in the divided state in a silo. The apparatus includes: a de-bridging system inside a converging bottom portion of the silo; a decompression enclosure at the bottom of the silo and having a diameter greater than the diameter of the end section of the converging portion of the silo; and a drive assembly for driving the substance along a horizontal duct in a direction substantially perpendicular to the vertical axis of the silo which duct is in communication with the bottom end of the decompression enclosure and includes a vertical outlet chute. A rotary loading arm is provided for keeping the drive assembly loaded with the divided substance so long as the divided substance flowing.