The photograph shows a dimly lit, possibly subterranean space in Velingrad, Bulgaria. The primary features are industrial components, including a series of red, spherical pressure tanks connected to black pipes and valves. Some of the pipes are aligned vertically. The floor is concrete, with a mottled, possibly damp surface. There are additional pieces of machinery and piping scattered throughout the area. In the upper portion of the image are two partially visible figures appearing to stand and observe the equipment.

Underground tunnel system explored in Bu

IMAGE

Pregyov

Creator

Sun, May 3, 2026, 06:03 AM

21h ago

Velingrad, Bulgaria

42.02800, 23.97900

The photograph shows a dimly lit, possibly subterranean space in Velingrad, Bulgaria. The primary features are industrial components, including a series of red, spherical pressure tanks connected to b…read more

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Technical

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