New German ocean going submarine design according to the Dutch magazine Marineblad 1917/1918 no. 3

An item referred to the magazine Army and Navy Journal dated 16 February 1917 reporting details of the new German ocean going submarines. With a displacement of 2.400 ton were the dimensions 260 x 25 feet. Horsepower 19.000 hp and a 26 (surfaced)-14 (submerged) miles. A crew numbering 60-80 men. Range 8.000 miles and victualler for 8 weeks. Possible diving depth 2000 metres.