What mystery lies inside the secret underground ‘tunnels’ of Teotihuacán Pyramids? - timelineoffuture
July 5, 2024

Sacred chambers and liquid mercury found inside the underground tunnels of Mexican Pyramids could hold the ancient secrets of Teotihuacán.

Imagine discovering a secret tunnel hidden beneath one of the oldest and most mysterious archaeological sites in the world. This happened in the Mexican city of Teotihuacán. The discovery of secret tunnels has brought new excitement and intrigue to an already intriguing place.

Deep in the heart of Mexico lies a fascinating archaeological site that has puzzled experts for centuries. Teotihuacán, which means "the place where the gods were created," is home to some of the most impressive pyramids and ruins in all of Central America. Teotihuacán pyramids complex is located in Mexican Highlands and Mexico Valley close to Mexico City. © iStock
Deep in the heart of Mexico lies a fascinating archaeological site that has puzzled experts for centuries. Teotihuacán, which means “the place where the gods were created,” is home to some of the most impressive pyramids and ruins in all of Central America. Teotihuacán pyramids complex is located in Mexican Highlands and Mexico Valley close to Mexico City. © iStock

Teotihuacán is considered one of the most important pre-Columbian cities in Mesoamerica and dates back to 400 BC. back. With its soaring pyramids, intricate murals, and unique artifacts, Teotihuacán has long captured the imagination of historians and adventurers.

And then, with the discovery of secret tunnels, the mystery of this place only grew deeper. What secrets can these tunnels hide? Who built them and why have they been hidden for so long? In this article, we take a look at the fascinating discovery of the Teotihuacán Secret Tunnels and the mysteries hidden within.

The ancient city of Teotihuacán

What mystery lies inside the secret underground 'tunnels' of Teotihuacán Pyramids? 1
Aerial view of the Teotihuacán pyramids complex. The Pyramid of the Moon (left), the Pyramid of the Sun (middle), the Pyramid of the Feathered Serpent (right). © Airbus / Fair Use

The ancient city of Teotihuacán, dubbed the “abode of the gods” in the ancient language Nahuatl, was once the nucleus of an empire. About 200,000 people are thought to have lived there between 100 and 700 AD, until its residents mysteriously hightailed it away. The city remained largely intact, but much is unknown about its people, how life flourished there and who was in the seat of power. Also unknown is whether power was passed down through a dynasty or if the ruler was an overlord.

Due to thick humidity and mud in the area, few excavations have been attempted at the site. The Spaniards did so in the 17th century, but no real progress was made until the 20th century.

Secret underground tunnels discovered in Teotihuacán

The 3D render of the Quetzacoátl Temple in the ancient city of Teotihuacán showing secret underground tunnels and chambers. © National Institute of Anthropology and History (INAH) / Fair Use

Researchers found three major tunnel systems in Teotihuacán, one below the Pyramid of the Sun, one below the Pyramid of the Moon, and one below the Feathered Serpent Pyramid (Quetzacoátl Temple); the last one is truly fascinating:

Tunnels underneath the Pyramid of the Sun

What mystery lies inside the secret underground 'tunnels' of Teotihuacán Pyramids? 2
Pyramid of the Sun, Teotihuacán. ©️ Wikimedia Commons

In 1959, archaeologist Rene Millon and his team of researchers were some of the first groups of archaeologists to study the tunnel system underneath the Pyramid of the Sun – the largest pyramid in Mesoamerica. While some of these tunnels were made after the fall of Teotihuacan and the Aztecs, they eventually connected to tunnels and caves that were made during the periods of these civilizations.

Millon’s investigations revealed that most of the main tunnels had been closed and whether this was intentional or not is open to interpretation. In the tunnels beneath the pyramid were pottery pieces, hearths, and other carefully crafted artifacts from other cultures found in other parts of Teotihuacán.

In, Millon and his team, based on their research and excavations, finally came to the conclusion that the pyramid was built continuously in different time periods by the people of Teotihuacán, or that the entire pyramid was built in a single time period, with its foundation and its Cave systems were run separately in earlier times. The division into periods is due to the expressive influence of different cultures on the artifacts found in the tunnels beneath the pyramid.

In 1971, archaeologist Ernesto Taboada discovered the entrance to a seven meter deep pit at the foot of the main staircase of the Pyramid of the Sun.The caves and tunnel systems beneath the pyramid have been studied by various archaeologists, who have concluded that these caves were as sacred to the people of Teotihuacan as caves in Mesoamerica were culturally significant.

Different sources point to different theories to interpret why the Pyramid of the Sun was built and what the underlying cave systems really mean to the Teotihuacán people and culture. Some believe the tunnel was used for religious ceremonies, while others believe it was an escape route for city leaders.

Secret chamber and tunnel underneath the Pyramid of the Moon

View of the Avenue of the Dead and the Pyramid of the Moon.
View of the Avenue of the Dead and the Pyramid of the Moon. © Wikimedia Commons

Archaeologists from Mexico’s National Institute of Anthropology and History (INAH) and the National Autonomous University of Mexico scanned the area of the Plaza of the Moon and the Pyramid of the Moon – the second-largest pyramid in Mesoamerica – in June 2017.

They have now confirmed there is also a chamber is eight meters (26 ft.) below the Pyramid of the Moon. It has a diameter of 15 meters (49 ft.), connects to the tunnel leading out towards the south of the Plaza of the Moon, and may have a western entrance into the chamber as well. These discoveries demonstrate that the people of Teotihuacan followed the same tunnel pattern in their largest monuments.

Tunnel underneath the Feathered Serpent Pyramid (Quetzacoátl Temple)

What mystery lies inside the secret underground 'tunnels' of Teotihuacán Pyramids? 3
Detailed 3D scan of the Quetzacoátl Temple. © National Institute of Anthropology and History (INAH) / Fair Use

Archaeologist Sergio Gomez, who worked on the conservation of the Temple of Quetzalcoatl – the third-largest pyramid in Mesoamerica – in 2003, came across the tunnel with Julie Gazzola after a very heavy, days-long rainstorm. A nearly three feet wide sinkhole opened at the base of the Feathered Serpent temple and when investigated with a flashlight and rope it was found to be a man-made shaft. At the bottom of the shaft was a tunnel blocked in both directions by enormous rocks.

The first excavation pictures were taken by a small remote-controlled robot, although what it found along with the real artifacts recovered is just as fascinating!

Over 75,000 artifacts have been found while exploring this tunnel leading to secret underground chambers, including things such as a wooden mask inlaid with jade and quartz, greenstone crocodile teeth, a box of beetle wings, and hundreds of metalized spheres. These mysterious balls ranged in size from about 1.5” to 5” and were made with a core of clay and covered with a yellow jarosite that formed from the oxidization of pyrite. These spheres would have shone like gold when they were created. The use and meaning of these little gold balls is still completely unknown.

At the end of the tunnel, a chamber representing the underworld was discovered. This chamber deep beneath the pyramid’s center contained a miniature landscape with pools of liquid mercury representing lakes. The walls and ceiling were decorated with different mineral powders (hematite, pyrite, and magnetite) to create the spectacular effect of standing beneath the stars at night.

The temple of Quetzalcoatl is a real tourist destination and has suffered accelerated deterioration from the constant traffic. Conservation efforts are continuously being made to ensure its protection. The tunnel beneath it is still under excavation which is probably why visitors are not yet allowed. Many of the discoveries were made available in 2017 at a major exhibition at the De Young Museum in San Fransisco, California.

Final words

The existence of secret tunnels in the heart of the ancient city of Teotihuacán has long been a mystery. No one knows exactly how these tunnels were constructed, nor why they were built or what they might have been used for. It is possible that the tunnels were used by priests to travel secretly between the major temples, but no evidence has yet been found to support that claim.

The archeologists are now claiming that the tunnels are both a ceremonial and a ritual site. Although there is no proof that the priests of Teotihuacan used them for the same purpose as the priests of Chichen Itza in Mexico, the symbolism is similar. The tunnels are also thought to be the graves of ancients. For instance, archeologists found skulls, bones, and tools in the tunnel that were likely used by the priests of Teotihuacan.

In other words, a great deal of archaeological research is still needed in this ancient site to uncover more fascinating information about these mysterious tunnels and their true purpose.

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