Vikipedia is fine for the general picture, but some details are wrong.
Decima (tenth) Mas was the elite unit who made these strikes, but MAS isn't at all the acronym for their crafts.
MAS is the acronym for "motoscafo armato silurante", meaning light and fast torpedoboat.
The craft used by our frogmen was officially named SLM, but it's better known as Maiale (Pig); not a midget submarine, mostly a modified drivable torpedo, carrying two men and magnetic mines.
Kiwi is right; the merchant was used for a strike at Gibraltar.
For the strike at Alexandria, the carrier was the sub Scirč.
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