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Sump (cave)
Sump or siphon is a term used in caving to describe a passage in a cave that is submerged under water. A sump may be static, with no inward or outward flow, or active, with continuous through-flow. Static sumps may also be connected underwater to active stream passage. When short in length, a sump may be called a duck.
== Exploration past a sump ==
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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