Submarine Nautilus largest of the Italian navy according to the Dutch magazine Marineblad dated 1913-1914 no. 5

Largest Dutch submarine Hr. Ms. K-I

An item reported that the largest submarine in the Italian navy was the Nautilus with a displacement of 400 (surfaced)-485 (submerged) tons and a speed of 16 (surfaced)-12 (submerged) miles.(1)

Note
1. The Netherlands were building at the same time an ocean going submarine Hr. Ms. K I with a displacement of just 333 (surfaced)-358 (submerged) tons and a speed of 17 (surfaced)-8 (submerged) knots. Laid down at Kon. Mij. De Schelde, Vlissingen, Netherlands on 16 September 1911, launched on 20 May 1913, commissioned on 5 July 1914 and decommissioned in 1829. She served in the Dutch East Indies. Her submarine Hr. Ms. O-2 who served in European (coastal) waters had a displacement of ""just 134 (surfaced)-149 (submerged) tons and was built between 1909-1911.