 Again, Grossi's success was widely reported, and he was promoted to "Capitano di Vascello" (Captain) and awarded a second Gold Medal; he left the submarine to replace Polacchini as BETASOM commander.After the war, Grossi's actions would be the object of two enquiries in 1949 and 1962, which concluded that he and his crew had been in good faith, but stripped him of his promotions and awards.On 24 January 1943, the submarine departed for its last mission as an attack submarine, in which it sunk the ships "Monte Igueldo" (3453 tls) on 24 February, "Alfonso Pena" (3540 tls) on 2 March, and "Staghound" on 3 March, before returning to Bordeaux on 3 April.