<Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (September 2017) (Learn how and when to remove this template message) </Td> </Tr> </Table> <Tr> <Td> </Td> <Td> This article needs additional citations for verification . Please help improve this article by adding citations to reliable sources . Unsourced material may be challenged and removed . (September 2017) (Learn how and when to remove this template message) </Td> </Tr> <P> Coordinates: 43 ° 49 ′ 32" N 28 ° 33 ′ 38" E ﻿ / ﻿ 43.825694 ° N 28.560556 ° E ﻿ / 43.825694; 28.560556 Movile Cave (Romanian: Peștera Movile) is a cave near Mangalia, Constanța County, Romania discovered by Cristian Lascu in 1986 a few kilometers from the Black Sea coast . It is notable for its unique groundwater ecosystem rich in hydrogen sulfide and carbon dioxide but very poor in oxygen . Life in the cave has been separated from the outside for the past 5.5 million years and it is based completely on chemosynthesis rather than photosynthesis . </P> <P> The air in the cave is very different from the outer atmosphere . The level of oxygen is only a third to half of the concentration found in open air (7--10% O in the cave atmosphere, compared to 21% O in air), and about one hundred times more carbon dioxide (2--3.5% CO in the cave atmosphere, versus 0.03% CO in air). It also contains 1--2% methane (CH) and both the air and waters of the cave contain high concentrations of hydrogen sulfide (H S) and ammonia (NH). </P>

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