Response crews continue to prepare the 154-foot towboat Stephen L. Colby for salvage and removal from the Mississippi River near LeClaire, Iowa, Dec. 10, 2013. Crews have worked continuously to repair and refloat the vessel since it reportedly struck an unknown submerged object in the Mississippi River channel and sank Nov. 25. (U.S. Coast Guard photo by Petty Officer 2nd Class Jaclyn Young)