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Deep underground in Romania lies one of Earth's most unusual ecosystems.

Movile Cave was isolated from the outside world for millions of years. Inside, there is no sunlight and no conventional plant-based food chain.

Instead, microorganisms can obtain energy through chemosynthesis, using chemical compounds in the cave environment. These microorganisms support a unique ecosystem containing highly specialized cave-dwelling animals.

From blind spiders and translucent creatures to microbial mats covering underground water, Movile Cave demonstrates just how adaptable life can be.

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Transcript
00:00There are caves on Earth where sunlight has never existed, and yet they are full of life.
00:07Deep underground, completely cut off from the outside world, are ecosystems that barely depend on the sun at all.
00:14Take Mobile Cave in Romania.
00:16It was sealed off for five and a half million years.
00:20No light gets in.
00:22No food gets in.
00:23The air is toxic, full of hydrogen sulfide and carbon dioxide.
00:28It should be dead.
00:30But it is not.
00:31At the bottom of the cave, the water is covered in a thick mat of bacteria.
00:36These bacteria do not use photosynthesis.
00:39They use chemosynthesis.
00:41They get their energy by breaking down chemicals like sulfur and methane.
00:45And everything else in the cave eats them.
00:47There are over 50 unique species found nowhere else on Earth.
00:52Blind spiders, translucent scorpions, leeches, and water scorpions, all living in complete darkness.
00:58No sun, no plants, just chemistry turning into life.
01:03It proves that life does not need sunlight.
01:06It just needs energy.
01:07It seems like a cool body.
01:07ان Gefampsio que cp303054886Qiw城.
01:08So it will end up in life forever.

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