re the Allies' maneuvering in Africa, the Italian Navy plans and signs an incursion into Algiers harbor; the operation, identified by the code "NA 1", sees the joint action of SLC operators (slow-running torpedoes known as "pigs") and "Gamma" men (assault swimmers), released in the roadstead by the submarine approaching Ambra , 4 December departed from La Spezia.
At 21.45pm the Italian boat is in the center of a semicircle around which six steamers are moored. From 5.00 to 7.00 the harbor rumbles due to multiple explosions: the Navy raiders sank the merchant ships Ocean Vanquisher and Berto and seriously damaged the steamships Empire Centaur and Harmattan for a total of over 22.000 GRT of shipping.
Source: Military Navy
