Koch (boat)
The Koch was a special type of small one or two mast wooden sailing ships designed and used in Russia for transpolar voyages in ice conditions of the Arctic seas, popular among the Pomors.
Because of its additional skin-planking (called kotsa) and Arctic design of the body and the rudder, it could sail without being damaged in the waters full of ice blocks and ice floes. The koch was the unique ship of this class for several centuries.
Read more about Koch (boat): Development, Construction, Classification