I fear the actual outcome of the Avorio/Regina encounter was sadder than that. In reality, after the shot that killed the skipper, the surviving crew started the scuttling procedures and abandoned the submarine, that was then boarded by a boat from Regina that was unable to prevent it from sinking. 26 men were rescued and taken prisoner by Regina, but another 20 died. Their names (along with those of all Italian submariners who died in the two World Wars) are here: http://regiamarinaitaliana.forumgratis.org/index.php?&showtopic=1429