"Free Dutch Submarine "dolfijn" Sank Italian Submarine in the Mediterranean. 12 To 14 February 1943, Algiers, the Royal Netherlands Submarine "dolfijn" Operating With British Naval Forces in the Mediterranean, Torpedoed and Sunk An Italian Submarine. This Is the Second Enemy Submarine Known To Have Been Sunk by the Dutch Submarine in the Mediterranean." The Dutch Submarine DOLFIJN entering harbour, at Algiers.