The following is a list of all the Italian submarines that were assigned to the naval base of Bordeaux codename BETASOM. Boats with a departure date indicate that they returned to Italy. Boat with a lost date indicate that they were lost while serving as part of the BETASOM base.
| Boat | Arrival | Departure | Lost | Notes | |
|---|---|---|---|---|---|
| Alessandro Malaspina | 9/4/1940 | 9/11/1941 | Sunk by depth charges from Sunderland “U” (serial # W3986) of 10 Squadron RAAF, piloted by Flight Lieutenant Athol Galway Hope Wearne, in position 46º23’N / 11º22’W.” | ||
| Alpino Bagnolini | 9/30/1940 | 3/12/1943 | Captured by the Germans in Bordeaux, later sunk by British airplanes while in transit to Japan off Cape Good Hope | ||
| Ammiraglio Cagni | 2/20/1943 | 8/8/1943 | Surrendered to the Allies in Durban, South Africa September 1943 | ||
| Archimede | 5/7/1941 | 4/15/1943 | Sunk by an American plane (VP No 83 Squadron) near the island of Fernando di Noronha, off the Brazilian coast. | ||
| Argo | 10/24/1940 | 10/20/1941 | |||
| Barbarigo | 9/8/1940 | 6/16/1943 | Lost between the 16th and the 24th in the Bay of Biscay | ||
| Brin | 12/18/1940 | 8/28/1941 | |||
| Capitano Tarantini | 10/5/1940 | 12/15/1940 | Torpedoed by the British submarine H.M. S/MThunderbolt at the estuary of the river Girond (Atlantic) | ||
| Comandante Cappellini | 11/5/1940 | 9/8/1943 | Captured by the Japanese in Sapang | ||
| Comandante Faa di Bruno | 10/5/1940 | 10/31/1940 | Sunk in Atlantic between 10/31 and 1/5/1941. The British Admiralty claimes that it was sunk by H.M.S. Havelock on Nov. 8th, 1940. | ||
| Dandolo | 9/10/1940 | 7/2/1941 | |||
| Emo | 10/3/1940 | 8/27/1941 | |||
| Enrico Tazzoli | 10/24/1940 | 5/18/1943 | Sunk between the 18 and the 24 in the Bay of Biscay | ||
| Ferraris | 5/9/1941 | 10/25/1941 | Scuttle after aerial bombing (Catalina A of the 202 R.A.F. Squadron) and attack by the British destroyer H.M.S. Lamerton East of the Azores Islands. | ||
| Giuseppe Finzi | 9/29/1940 | 8/8/1943 | Transferred to Germany | ||
| Glauco | 10/22/1940 | 6/27/1941 | Scuttled after an attack from Wishart near Gibraltar | ||
| Guglielmo Marconi | 9/28/1940 | 10/28/1941 | Lost in the Atlantic probably off the Strait of Gibraltar | ||
| Guglielmotti | 5/6/1941 | 9/30/1941 | |||
| Leonardo Da Vinci | 10/31/1940 | 5/23/1943 | Sunk by depth charges by the frigates Active and Ness 300 miles off Vigo, Spain | ||
| Luigi Torelli | 10/5/1940 | 9/21/1941 | |||
| Maggiore Baracca | 10/6/1940 | 9/8/1941 | Bombed and rammed by the British destroyer Croome in Atlantic. | ||
| Marcello | 12/2/1940 | 2/22/1941 | Sunk in Atlantic by British destroyer Hurricane and Montgomery or, most probable, the Perwingle. | ||
| Michele Bianchi | 12/18/1940 | 7/5/1941 | Torpedoed by the British submarine Tigris off Bordeaux. | ||
| Mocenigo | 12/26/1940 | 8/23/1941 | |||
| Morosini | 11/28/1940 | 8/11/1942 | Probably sunk by a British plane in Atlantic | ||
| Nani | 11/4/1940 | 1/7/1941 | Probably sunk by the British corvette Anemone near Iceland | ||
| Otaria | 10/6/1940 | 9/14/1941 | |||
| Perla | 5/20/1941 | 9/28/1941 | |||
| Pietro Calvi | 10/23/1940 | 7/15/1942 | Scuttled at 0:27 AM after an attack by the British destroyer H.M.S. Lulworth near the Azores | ||
| Reginaldo Giuliani | 10/6/1940 | 9/8/1943 | Captured by the Japanese in Sapang, later manned by the Germans and sunk by the British submarine Tally-Ho | ||
| Velella | 12/25/1940 | 8/25/1941 | |||
| Veniero | 11/2/1940 | 8/17/1941 |