Spigola was a submarine of the Tritone (or Flutto) class, 1st series with a displacement of 905 tons surfaced and 1.070 tons submerged. Crew was expected to be 49 men including 5 officers. Laid down on June 10th,1943 (Navy Day in Italy) at the Tosi shipyard in Taranto, work was suspended after the Italian armistice of September 8th, 1943. Cernia and Dentice were also under construction in the same shipyard and had the same fate. The boat, no longer necessary to the war effort, was never completed and broken up in 1948.
An image of Flutto to render an idea of the expected final look of Spigola