Max depth 90 m (300 ft)
I doubt it.
"Plenty of water in the Indian ocean. The Iranian coast is not just the Persian Gulf."
The Times story says: "Three German-built Israeli submarines equipped with nuclear cruise missiles are to be deployed in the Gulf near the Iranian coastline.".
Israel might be getting ready to glass Iran from the Indian Ocean (or may be getting ready to do something about Hizbollah's Scud missiles in Syria) but subs operating on the surface or at minimal depth in the Persian Gulf defeats the purpose of using submarines. The US Navy would know where they were at all times to the nearest foot if not inch and the Iranians would probably have a good idea where they were, too. Israel only has a few subs and it would probably lose them. There would be repercussions, and in the post-glassed-Iran era with an Islamic world even unhappier with Israel than it is now, the subs would probably be useful for Israel's survival. IMO it's unlikely that the news story is accurate. Could be saber rattling, or they may have something else planned. Or maybe they just want to amuse themselves watching the Iranian Navy dragging grappling hooks through the Persian Gulf. If they planned a surprise attack, leaking it to the Times is hardly the way to do it.