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109 ships of 593,864 tons in Atlantic
During the Battle of the Atlantic, Italian submarines sank several Allied warships, contributing to a total of approximately 20,000 tons. Notable sinkings included the British destroyers HMS Hurricane and HMS Daring, as well as merchant vessels that supported Allied operations. These actions were part of Italy's broader strategy to disrupt Allied supply lines during World War II. However, the overall impact of Italian submarines in the Atlantic was limited compared to their German counterparts.
During WWII, Allied warships used ASDIC (an early, crude form of Sonar), airplanes (some ships carried recoverable seaplanes), and visual lookouts (binoculars) to spot submarines and direct attacking vessels to the contact.
ships or boats
During WWII the Finnish navy operated five small submarines, all designed in the Netherlands (by a Dutch front company) and built in Finland. Between them they sank one Soviet merchant ship and three Soviet submarines. All Finnish subs survived the war.
IJN subs were deployed for "fleet warfare", not merchant raiding. The costly job of sinking allied warships fell to the IJN sub fleet. It's estimated that IJN submarines sank less than 50 merchant ships during the war.
sink allied supply ships to England
French Master Ferdinand Foch prescribed the actual terms of ending the way. It includes cessation of hostilities, condition for terminating or prolonging the armistice, disposition of German submarines and warships, promise of reparation, exchange of prisoners and preservation of infrastructure.
u-boats