Secret rooms,
tunnels, aqueducts –
deep below the surface!

The “Tunnel of Contents” shows a wide range of underground projects, each commanding a double-page spread in this oversized book.

From the ancient Gadara Aqueduct carrying water underground for 60 miles in 2nd century Jordan to 3D-printed habitats in caverns under the surface of Mars in the future, each project has a specific purpose.

Both the 3rd century Temple of the Feathered Serpent in Mexico and Quinta da Regaieira in early 1900s Portugal held secret ceremonial sites far below the surface.

The Seoul Subway system is the world’s largest, carrying 7 million people yearly on its 200 miles of underground tracks.

The Delaware Aqueduct carries water to New York City, while the Eastern Discharge Tunnel carries flooding rainwater away from Mexico City.

Some diagrams are so large that you need to turn the book sideways to see them, like the White House Bunker, and the Drummen Spiral where the road to a mountaintop spirals inside the mountain, leaving its trees and animals undisturbed.

By the way – did you know that the Chunnel carrying trains under the English Channel is actually 3 tunnels?

Look for this fascinating array of meticulously hand-drawn scenes with lots of facts and history at your local library https://search.worldcat.org/libraries or independent bookstore https://bookshop.org/ .

How far underground have you gone?
**kmm

Book info: Big Digs: Amazing Underground Constructions / Kiko Sanchez; translated by Marc Correa. Helvetiq, 2026. [author/illustrator https://www.tormentalibros.com/en/illustrators/kiko-sanchez] [publisher site https://helvetiq.com/us/big-digs] Review copy and cover image courtesy of the publisher, via Publisher Spotlight.