BETASOM

BETASOM
Bordeaux Sommergibili
Bordeaux, France
BETASOM
Coordinates	44°52′03″N 0°33′34″W / 44.867534°N 0.559341°W / 44.867534; -0.559341
Type	Submarine base
Site information
Controlled by	Regia Marina
Site history
In use	August 1940–September 1943
Battles/wars	Battle of the Atlantic
Garrison information
Past commanders	Angelo Parona (August 1940-September 1941) Romolo Polacchini (September 1941-December 1942) Enzo Grossi (December 1942-September 1943)
Garrison	1,600
Occupants	Regia Marina

BETASOM (an Italian language acronym of Bordeaux Sommergibile was a submarine base established at Bordeaux, France by the Italian Regia Marina Italiana during World War II. From this base, Italian submarines participated in the Battle of the Atlantic from 1940 to 1943 as part of the Axis anti-shipping campaign against the Allies.

Axis naval co-operation started after the signing of the Pact of Steel in June 1939 with meetings in Friedrichshafen, Germany, and an agreement to exchange technical information. After the Italian entry into the war and the Fall of France, the Italian Navy established a submarine base at Bordeaux, which was within the German occupation zone. The Italians were allocated a sector of the Atlantic south of Lisbon to patrol. The base was opened in August 1940, and in 1941 the captured French passenger ship De Grasse was used a depot ship before being returned to the Vichy French Government in June 1942. Admiral Angelo Parona commanded the submarines at BETASOM under the control of Konteradmiral (Rear Admiral) Karl Dönitz. Dönitz was the "Commander of the Submarines" (Befehlshaber der Unterseeboote) for Nazi Germany's Kriegsmarine. About 1,600 men were based at BETASOM.