dredge

A barge or pontoon carrying digging buckets or suction pump, used for excavating alluvial deposits below water.

[img_assist|nid=11968|title=Jet-pump|desc=Inland dredger|link=none|align=left|width=316|height=200]

[img_assist|nid=14516|title=|desc=Marine dredger|link=none|align=left|width=249|height=200]