The Cave Sealed for Five Million Years
Workers in Romania broke into a cave cut off from the outside world for about five million years. Inside, in total darkness, things were alive.
What was reported
In 1986, workers testing the ground for a planned power station near Mangalia, on Romania's Black Sea coast, broke into a hidden cave. Movile Cave had been sealed off from the surface for an estimated five million years. Its air is warm and thick with carbon dioxide and hydrogen sulphide, and holds little oxygen.
Scientists found an entire living world inside: dozens of kinds of spiders, scorpions, leeches, centipedes and other animals, most of them found nowhere else, blind and pale. They live on the edge of a lake covered in a floating mat of bacteria.
Explanations offered
The cave's ecosystem doesn't rely on sunlight. Its food chain is built on bacteria that get energy from chemicals in the water, a process called chemosynthesis, rather than from plants. Very few people are allowed in to protect it. It's studied as a model for how life might survive on other worlds.
- When
- Discovered in 1986
- Where
- Movile Cave, near Mangalia, Constanța, Romania
- Witnesses
- Romanian and international scientists
- Status
- Confirmed
Famous cases are real, widely reported events. Each file sets out what witnesses said and the explanations that have been offered, without taking a side.
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