Since First World War the Italian Regia Marina was deserved great focus on the development of small and rapid vessels generally armed with torpedoes. The moto torpedo boats, more known as MAS, were civilian vessels variations. The Outcomes accomplished during First World War had been remarkable using the sankment, with respect to Commandant Luigi Rizzo, of Austro-Hungarian Marine battleships Wien and Szent István. Neither less were considerably better for restricted seas and shallow water just like the Adriatic water, the Italian Marine continued working to improve the performance of this small but fast moto torpedoes. The MAS 500, prepared gasoline machines Isotta-Fraschini, develop during Second World War and much more powerful and reliable, had been deployed both as moto torpedoes and anti submarine platforms for level charges dropping. With the capacity of reaching a high rate of 40 knots and armed with two 450mm torpedoes.
