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An enclosed air space between the water surface and the roof of a cave 10. 2. Part of a flooded passage where the ceiling rises above the water level to create an air pocket isolated from the rest of the cave 9

taken from (network.speleogenesis.info/directory/glossary/term.php?gloss_id=46)
Cave divers oftenly surface in an air bell to rest.
by interpretation_bridge April 24, 2011
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