Passages engineered under a mountain, strait or urban obstacle to carry a road or railway, from early mountain rail tunnels through the undersea tunnels that link countries separated by water. Belongs here: any named tunnel of historical or engineering significance, road or rail. Does not belong here: bridges, which cross an obstacle rather than passing under it, or the strait or mountain range a tunnel passes through, which belongs to Geography.
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1. Wikipedia: Tunnel of Eupalinos
WikipediaTunnel of Eupalinos, construction dateQuote, Tunnel of Eupalinos, construction date
The tunnel was dug in the mid-6th century BC, by two groups working under the direction of the engineer Eupalinos from Megara, in order to supply the ancient capital of Samos (today called Pythagoreion) with fresh water.
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