Obbusen
Between 1877 and 1884, on behalf of Russian financier Baron von Knoop, Dallmann made annual attempts to haul freight to the Gulf of Ob and the Yenisei Gulf, to be exchanged for grain and other cargoes brought down the great Siberian rivers by means of barges. Owing to the ice conditions in the Kara Sea, only four out of seven attempts were successful. Finally, von Knoop stopped the difficult venture so as to cut his losses. Despite the few failures, Dallmann had received the rare opportunity to explore many of the Kara Sea-islands and shores seen by few Europeans.