Five man-made tunnels at different ends of the planet, which still lead scientists to a dead end. We descend from top to bottom, from an engineering miracle to the most human mystery, and throughout the entire issue we keep one question in our heads. We already know how they dug it, but most importantly: we don’t know why?

The Eupalina Tunnel on the Greek island of Samos, cut through a mountain from two sides towards each other and meeting in the middle with a precision that would be the envy of a modern engineer. Longyu Caves in China, twenty-four underground halls, about which not a single chronicle has dropped a word for two thousand years. Erdstalle earthen passages in Bavaria and Austria, narrow holes to nowhere, inside which archaeologists find nothing at all. The Hypogeum of Hal Saflieni in Malta, an underground stone-age temple of the dead where a deep voice echoes within the rock itself. And the underground city of Derinkuyu in Turkish Cappadocia, where twenty thousand people were hiding underground from the war.

🏛 Eupalina Tunnel, a mountain cut through
🕳 Longyu, halls that are not in the chronicles
👣 Erdstalle, holes to nowhere
🔊 Hypogeum, a stone that answers a voice
🏙 Derinkuyu, a city that went underground

1. Hermann J. Kienast. Die Wasserleitung des Eupalinos auf Samos. Deutsches Archäologisches Institut, 1995.
2. Herodotus. History, book three (about the affairs of the Samians).
3. Yang Hongxun et al. Publications on the study of Longyou Caves, Zhejiang Province, 1990s and 2000s.
4. Heinrich Kusch, Ingrid Kusch. Erdställe. Geheimnisvolle unterirdische Gänge. 2009.
5. Josef Weichenberger and Erdstall-Forschung (Arbeitskreis für Erdstallforschung), periodical publications.
6. Themistocles Zammit. The Ħal Saflieni Prehistoric Hypogeum. Excavation reports, 1910s.
7. UNESCO World Heritage Centre. Ħal Saflieni Hypogeum, object file.
8. Omer Demir. Cappadocia: Cradle of History (about the underground cities of Derinkuyu and Kaymakli).
9. Andus Emge. Wohnen in den Höhlen von Göreme (about the underground settlements of Cappadocia).

The video was created for educational and educational purposes. All objects are real and verifiable from open sources. Alternative, conspiracy and paranormal versions are presented as hypotheses and legends, and not as established scientific truths. The story of the missing children in Malta is explicitly identified in the release as an unreliable twentieth-century legend.

#history of the ancient #underground cities #mysteries of history