Sorry, but you don't understand how has gone the History and how has gone with the Italian's Maiale-missions.
Read this about the XMas:
http://it.wikipedia.org/wiki/X%C2%AA...o_d'Italia)
I'm Italian and I know how this piece of History as gone, I am a member of the ANMI (Italian - Men of Sea Association: retired military sea-man basicly) and I see the PIG, really called "SLC -Siluro a Lento corsa" (Slow-running Torpedo in English) and the "Barchino Esplosivo" (Exploding Boat in English), both at Arsenal-Museum in La Spezia (Italy).
The X MAS-Pigs missions was similar to this one:
The SLCs uses a 2 military divers-crew and they gone slowly below the enemy ships anchored in a bay, "attach" the SLC to one primary-big target ship (yes, they works for a lot of time and attach litteraly the SLC to the ship with a big screw...) set the timer, then both divers swim-away and after 1 or 2 hours.... You can hear A REAL BIG BOOM !!! And the SLC crew was sit on a hill, well far away from the sea, on theyr escape-route..
The "Barchino Esplosivo" was a little high-speed motor boat, full of explosives, for running into the side of an enemy ship BUT don't stop here !!
The pilot, a diver, sits on an rudimental Escape-system, with a simple metal-bar he can recline-back the seat and exit from the boat, before the BIG BOOM !!
As I know, and I speak and listen the hystories from various retired sea-man, it's NOT a Kamikaze-unit the Decima MAS !!!
It was famous as a Special-Unit,a special-divers unit for Special-Incursions !!
Please, read before write....
HI, Maw-68.
Reggio Emilia, Italy.