Acciaio-class submarine

The Acciaio class, also called the Platino class, was the fifth and last sub-class of the Italian 600 Series of coastal submarines. Thirteen boats were built for the Regia Marina and completed in the early 1940s: six by the Cantieri Riuniti dell'Adriatico at Monfalcone, four by Odero Terni Orlando at Muggiano and three by Tosi at Taranto, the three main Italian submarine yards. They were developed from the Adua and Perla designs to a Bernardis design, with a lower conning tower to improve stability and reduce the silhouette. The Tosi boats had more powerful engines at the expense of the two stern torpedo tubes, which gave them a surface speed of 14.7 knots. All of the class saw service in the Second World War.