The longest of them all is an underground aqueduct of 137 kilometers

An interesting 3D comparison that shows us the longest tunnels in the world

Among the engineering works that have existed throughout history, tunnels are, without a doubt, one of the most complex and at the same time the most fascinating.

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The Spaniard Álvaro Gracia Montoya, author of the excellent YouTube channel MetaBallStudios, has published today an interesting video made in 3D on a computer in which he reviews the longest tunnels in the world, both those dedicated to vehicle traffic and those whose purpose is water supply for human consumption. It is noteworthy that one of the longest tunnels is the Gadara Aqueduct, built by the Roman Empire in present-day Jordan and that in total it had a length of 170 kilometers, although the longest of its tunnels (as the video indicates) measured 94.

Today, the longest tunnel is the Delaware Aqueduct, with a length of 137 kilometers and a width of 4.1 meters. It was built between 1939 and 1945 and supplies water to the city of New York: a total of 4.9 million cubic meters of water every day. However, much longer tunnels are being built in China today, for the same purpose: to supply water to its huge cities.

Photo: Zacharie Grossen. The Gotthard Base Tunnel in Switzerland.

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