The “Talpidae” apparatus was developed during the course of my PhD.

It acquires data in small-scale distances (10-50cm) between the “surface” and a “tunnel”. It has two parallel arrays and adjustable components. The green pipe is filled with water and simulates the ground surface, the blue simulates the “inside-the-earth” array and the black pipe is empty,(being filled with air) and simulates a tunnel. The apparatus is stable and uses pre-calculated distances to set the pipes at precise distances.