Link: https://www.youtube.com/watch?v=gaQ4LCmMEtM

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The original was posted on /r/highstrangeness by /u/No_Money_9404 on 2026-06-18 15:57:37+00:00.

In 1963, a man renovating a basement in central Turkey reportedly broke through a wall and found a passage carved into solid rock.

That passage led into Derinkuyu — an underground city beneath Cappadocia descending nearly 280 feet below the surface.

What makes it strange isn’t “lost advanced technology.” The volcanic tuff in the region is soft enough to carve with simple tools. The strange part is the scale, planning, and purpose.

Derinkuyu contains ventilation shafts, wells, storage rooms, churches, livestock areas, kitchens, narrow defensive corridors, and massive circular stone doors that could seal tunnels from the inside. Some estimates suggest it may have sheltered up to 20,000 people during emergencies, though that number is probably a maximum capacity estimate rather than a permanent population.

The most interesting mystery is still unresolved:

Nobody knows for certain who first built the original tunnels.