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Dredging
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====Air-lift==== An [[Airlift (dredging device)|airlift]] is a type of small suction dredge. It is sometimes used like other dredges. At other times, an airlift is handheld underwater by a [[underwater diving|diver]].<ref name=RRR4672>{{cite book |author=Robbins, R |chapter=USAP Surface-Supplied Diving |editor=Lang, MA |editor2=Smith, NE |title=Proceedings of Advanced Scientific Diving Workshop |publisher=Smithsonian Institution |location=Washington, DC |year=2006 |chapter-url=http://archive.rubicon-foundation.org/4672 |access-date=5 April 2013 |archive-date=26 May 2014 |archive-url=https://web.archive.org/web/20140526013827/http://archive.rubicon-foundation.org/xmlui/handle/123456789/4672 |url-status=dead }}</ref> It works by blowing air into the pipe, and that air, being lighter than water, rises inside the pipe, dragging water with it.
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