Mining technique at Eupalinos tunnel in Samos in horizontal cross-section, at the expected point of meeting of the two tunnels, to make sure that one tunnel will meet the other, covering small mistakes in the calculations of the engineer (also see the same technique applied in vertical cross section at <a href="//commons.wikimedia.org/wiki/File:Eupalinos_vertical.svg" title="File:Eupalinos vertical.svg">File:Eupalinos vertical.svg</a>). Designed by User:FocalPoint, after Hermann J. Kienast (The aqueduct of Eupalinos in Samos), Athens 2004, publication of Greek Ministry for Civilisation
Designed by User:FocalPoint
CC BY-SA 3.0
<a href="//commons.wikimedia.org/wiki/File:Eupalinos_horizontal.JPG" title="File:Eupalinos horizontal.JPG">File:Eupalinos horizontal.JPG</a>