I am repeating a post which I commented on the warsailors forum:
At 1320/10 September 1942, the Greek submarine Papanicolis (Cdr Spanidis) sighted a convoy described as an 8000 ton tanker and two escorts coming from the westward 5 miles east of Piskopi (Aegean), range was over 10,000 metres and the submarine tried to close but the convoy passed at about 4,000 metres and torpedoes were not fired.
Commander Spanidis could have closed at a faster speed but was reluctant to do so as he feared his higher speed would disclose his presence to the escorts. Because of this failure he was relieved from his command.
The targets were probably the freighters Arsia (I believe she was the ex Irma Calzi, 668 GRT, built 1907) [not the same Arsia as the one torpedoed by HMS Unique in 1941) and Pola escorted by the auxiliary Orsini proceeding from Piraeus to Rhodes where they arrived at 1900/10 September. The description does not match closely with that of Spanidis but he probably used his periscope very sparingly and had only a quick look. The war diaries of the Italian Northern Aegean Command (Comando Gruppo Navale Italiano Egeo Settentrionale) does not reveal any other convoy that could have been the target of the Greek submarine.
By a curious coincidence there was also a schooner Arsia (175 GRT) which was damaged by bomb at Tobruk on the same day. She was present during the failed raid on Tobruk (operation AGREEMENT). She managed to reach Tripoli and then Trapani on 2 December 1942. She was at Pola at the Italian Armistice.
I would be interested in more details on these two Arsia as well as the freighter Pola and the auxiliary Orsini and their subsequent fate.