Submarine Service (Regia Marina)

Submarine Service (Regia Marina)
Unit name	Submarine Service (Regia Marina)
Native name	Servizio Sommergibili (Regia Marina)
Country	Kingdom of Italy
Branch	Regia Marina
Type	Submarine force
Dates	1913–1946
Garrison	Rome, Taranto
Notable commanders	Admiral Angelo Iachino, Admiral Arturo Riccardi, Admiral Duilio Bonaccorsi

Submarine Service (Regia Marina) was the submarine arm of the Regia Marina of the Kingdom of Italy from the pre‑World War I era through World War II, playing a central role in Mediterranean naval strategy during the Interwar period and the Second World War. The service grew from experimental coastal boats to a fleet comprising multiple classes, participating in operations around Malta, Alexandria, Sicily, Crete and the Atlantic Ocean; it interfaced with naval institutions such as the Ufficio Navi and responded to strategic directives from the Ministry of the Navy (Italy). Its fortunes were shaped by figures associated with the Regime of Benito Mussolini, strategic rivals like the Royal Navy (United Kingdom), and later the Italian Co‑Belligerent Navy and the Marina Militare transition after the Armistice of Cassibile.

History and Origins

The Submarine Service originated in the early 20th century amid naval innovations following the Italo‑Turkish War and the era of Admiral Paolo Thaon di Revel; early experimentation involved designs by firms such as FIAT San Giorgio and builders at the Regio Arsenale di Venezia. During World War I the service operated alongside units of the Regia Marina in the Adriatic Sea against the Austro‑Hungarian Navy, deploying boats influenced by designs from Cesare Laurenti and lessons from encounters at Otranto Barrage and the Battle of the Strait of Otranto. Interwar naval treaties including the Washington Naval Treaty and naval politics under Giuseppe Volpi, 1st Count of Misurata affected procurement leading into the 1930s rearmament programs overseen by ministers such as Carlo Schanzer and commanders connected with the Italian naval staff.

Organization and Command Structure

Command was vested in the Submarine Directorate within the Regia Marina high command, reporting to the Ministry of the Navy (Italy) and coordinating with fleet commands at bases like Taranto, La Spezia and Brindisi. Squadrons were organized into flotillas (VIII, IX, X Flotillas) under commanders who communicated with operational centers in Rome and tactical headquarters supporting operations in the Mediterranean Sea and the Atlantic Ocean via bases in Betasom (Bordeaux) under arrangements with the Italian Social Republic and earlier diplomatic contacts with the Vichy France administration for Atlantic use. Personnel structures mirrored other navies with ranks aligned to the Regia Marina hierarchy, involving figures who interacted with institutions such as the Accademia Navale (Livorno) and staff colleges influenced by doctrines drawn from experiences with the Royal Navy (United Kingdom) and the Kriegsmarine.

Vessels and Classes

The fleet included diverse classes from coastal to oceanic types: early classes like the Foca‑class submarine and Glauco-class submarine evolved into oceanic units such as the Marcello-class submarine, Calvi-class submarine, Tarantino-class submarine and the Adua-class submarine. Experimental and large types included the Balilla-class submarine and the ambitious Cavour-class submarine projects; transport and special purpose conversions were also undertaken exemplified by conversions associated with the Decima MAS innovations and experiments similar to human torpedo operations. Foreign designs and license builds involved companies such as Cantieri Riuniti dell'Adriatico and Tosi, while captured or interned vessels sometimes involved interaction with the French Navy and German Kriegsmarine assets.

Operations and Engagements

Submarine operations ranged from convoy interdiction and reconnaissance to minelaying and special operations during the Battle of the Mediterranean, engaging in battles and patrols near Malta Convoys, the Battle of Matapan, the Siege of Malta and actions against Operation Halberd convoys. Atlantic deployments from Betasom targeted Allied shipping and convoys coordinated with the Luftwaffe in joint efforts against Operation Pedestal and other supply missions to Malta; Mediterranean clashes involved encounters with units of the Royal Navy (United Kingdom), the Hellenic Navy, and later the United States Navy. Notable episodes included clandestine attempts to interdict supply routes to Alexandria and support operations during the North African Campaign and the Sicilian Campaign.

Training, Doctrine and Tactics

Training was conducted at shore establishments and afloat schools tied to the Accademia Navale (Livorno) and bases at Taranto, emphasizing patrol discipline, torpedo attacks and submerged endurance derived from earlier experiences in the Adriatic Sea and influenced by naval thought from the Interwar period. Doctrine evolved under pressure from encounters with Royal Navy (United Kingdom) anti‑submarine tactics, advances in sonar and Hedgehog‑type countermeasures used by the Royal Navy (United Kingdom) and the United States Navy, and adaptations to Mediterranean shallow water operating conditions similar to lessons from the Dardanelles Campaign and the Gallipoli Campaign heritage within Italian naval studies.

Technology, Armament and Equipment

Italian submarines carried torpedo armament from manufacturers like Whitehead Torpedo Works and deck guns varying by class, alongside radio and periscope equipment supplied by Italian firms and licensed foreign suppliers. Hull designs incorporated double‑hull concepts derived from designers such as Cesare Laurenti and shipyards including Cantieri Riuniti dell'Adriatico and Cantieri Riuniti del Golfo; propulsion used diesel engines from builders like FIAT and electric systems influenced by developments also seen in German Kriegsmarine engineering. Countermeasure technology they faced included sonar systems from the Royal Navy (United Kingdom) and anti‑submarine depth charge patterns refined during the Battle of the Atlantic.

Losses and Casualties

Losses were substantial during World War II with many submarines sunk by Royal Navy (United Kingdom) forces, Royal Air Force, United States Navy aircraft, and Axis mines or accidents; notable engagements produced losses around battles and convoy actions such as those linked to Operation Pedestal and the Battle of the Mediterranean. Casualties affected crews drawn from institutions like the Accademia Navale (Livorno) and coastal naval communities; post‑armistice fragmentation saw some units interned in Malta or surrendered to Allied forces after the Armistice of Cassibile, while others were scuttled to prevent capture by the Kriegsmarine or taken over by the Italian Social Republic authorities.

Legacy and Postwar Fate

After the Italian Co‑Belligerent Navy realignment and the foundation of the Marina Militare in 1946, surviving hulls and technological lessons fed into postwar submarine procurement, cooperation with the United States Navy and participation in NATO naval planning; classes and doctrinal experience influenced designs leading to Cold War units and collaborations with shipyards such as Fincantieri. Memorialization occurred at sites in Taranto and La Spezia and through histories recorded by institutions including the Museo Storico della Marina Militare and veterans' associations connected to veterans of the Second World War.

Category:Regia Marina