Two interesting reports that explain how the Roman aqueducts worked

Ancient Rome was known for its great engineering works, which met the great needs of the vast population of that empire.

This was a city of ancient Rome: an explained walk through the streets of Pompeii
Spanish explorers enter the restricted area of the Paris Catacombs

One of the most basic needs was the supply of water. To do this, Rome built hundreds of aqueducts throughout the empire's territory (and the city of Rome alone had up to 12 aqueducts). The best known, for their architectural beauty, are those that run at a certain height through arches, such as the famous Segovia aqueduct (below these lines). These arched aqueducts were used to bridge some unevenness in the terrain.

However, most of the routes of the aqueducts were made underground, digging tunnels that required a certain amount of maintenance to prevent them from ending up clogged, which often made them as tall as a person. This form of construction is the reason why there are still Roman aqueducts that have not yet been discovered, since they were forgotten.

On this fascinating subject, a year ago the channel Toldinstone published an excellent video in which he explains how these aqueducts were built, and for what purposes:

In this other video, posted by Aqva Dvcta seven years ago, we can see a 3D recreation of the Roman aqueduct of Gades (the current Spanish city of Cádiz), which for most of its route passed through underground galleries:

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Photos: Elentir.