 Complete the following phrase:  He volunteered for the navy in January 1934 and was assigned to the diving division, attending the Scuola C.R.E.M. at Varigo near La Spezia. At the end of the course he was assigned to the naval command at Gaeta. He then joined the destroyer Freccia and in 1936 the submarine H6, attended the first diving course and took part in the first experiments in exiting a submerged submarine. At the end of the course he took part in the 