During the first part of the World War II something happened on US territory that nobody could explain

SYNOPSIS:

When Germany declared war on the United States, the American east coast presented itself as a vulnerable target for the German U-Boot, but not only: this situation was underlined by the resounding success achieved by the submarines of Dönitz with Operation Paukenschlag, but not all the attacks were aimed at convoys of ships and not all submarines were German, one was Italian on a mission with the aim of penetrating the bay of new york and sowing panic by means of a secret weapon embarked.