This is the
Deutschland, a privately built, owned and operated U-boat whose sole purpose was to run the British naval blockade; something she did in 1916, sailing from Germany to the United States and back several times. She also made trips to South America. Nor was she alone; the
Bremen was another operational commercial U-boat, and six more were under construction when the United States entered the war. But the
Deutschland was able to transport only 750 tons of cargo, at a time when cargo ships were generally carrying loads in excess of 8,000 tons.