Why build a full sized sub for that?
It would be a waste of crew and material. (Cuts down on the peak load demand for lots of 72 virgins, too. )
Yep. Another interesting side note from the article:
"The report said the submarine, named Ghadir, was Iran's second homemade submarine, and was unveiled during the third day of military maneuvers in southern Iran."
Ghadir(according to a quick google)was the site of the last message and pilgrimage of the 'prophet', where he chose his successor and hence first leader of the caliph. Seems to be a bone of contention between the sunnis and shia as to what the Ghadir passage in the Quran means.
So, in essense, Iran is thumbing it's nose to the Sunnis naming this submarine Ghadir.