Developed in Russia around the 11th Century, The Koch Ship was a special classification of vessels, designed to be small with 2 Masts for wind power. They were used primarily for transpolar voyages in The Arctic Sea Region. Built of double layered (or planked wood) and shaped more streamlined, The Koch was unique for it's ability to navigate in ice floe conditions. This class of vessel was around 30 to 50 feet in length. The cleverness in over-planking design as well as it's long lived history (lasting into the 19th Century), - The Koch “ice breaking” innovations would carry over into modern Arctic Ship building.