UIS Commission on Karst Hydrogeology and Speleogenesis
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Glossary of Karst and Cave Terms

duck; duck-under
1. A place where water reaches the cave roof for a short distance and can be passed by quick submergence without swimming. 2. In cave diving, a longer stretch of passage where the water is so close to the roof that crawling or swimming beneath the water surface is needed to pass [10].