Abstract: A compactable, foldable, floatable, continuous, boom-fence is quickly and readily launched, often from the deck of a boat, via accordian-like folded sections, in turn quickly interconnected to like sections, to form an overall boom-fence projecting above the water surface, while also depending below the water surface, thereby creating a water boom to fence a large water surface area during the control of a contaminate unwantedly spreading over a surface of water. Each section of the boom-fence comprises planar rectangular fence panels flexibly secured together with flexible coupling panels and cable, and provided with both planar buoyant materials and planar retractable hinged dampening fins, tending to keep the planar rectangular fence panels upright during their deployment, when confronted with forces created by waves, wind, and tides or currents.