In the midst of the First World War in Germany, an event occurred that left a noticeable mark in the history of underwater shipbuilding and navigation. 23 June 1916 . Kiel harbor left the first created for transport purposes submarine "Deachland" Commanded the boat one of the most experienced captains of the German merchant fleet Paul Koenig . With no cargo on board and no diplomatic mail, Deutschland headed for the North Sea to cross the Atlantic Ocean and arrive in the North American United States. Thus Germany tried to prove to the whole world, and first of all to Britain, the ineffectiveness of the blockade she had carried out. Having repeatedly visited the strongest storms, overcoming all difficulties, the Deutschland crossed the ocean and reno on the morning of July 9, 1916. Entered the American port of Baltimore .