Eupalinos Tunnel Meets Midway

In the mid-6th century BC on the Greek island of Samos, engineer Eupalinos of Megara set crews to dig an aqueduct tunnel through Mount Kastro from both ends at once. Using careful geometry to guide the headings, the teams advanced through 1,036 meters of rock until their passages finally met. The underground conduit secured a protected water supply for the city and later earned recognition as an early masterpiece of surveying and civil engineering.

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