"A senior Israeli defense official
confirmed that Dolphin-class subs
carry modified U.S. Harpoon antiship
missiles. Making them nuclear capable
would require an Israelideveloped
nuclear warhead and guidance
kit for land-attack targets. It is
unknown whether the missiles have
that modification. In March 2000,
the United States rejected Israel’s request
for 12 long-range BGM-109
Tomahawk cruise missiles. The Tomahawk
sea-launched cruise missile
exists in a nuclear-tipped version for
delivery by U.S. attack subs."
http://www.thebulletin.org/issues/nukenotes/so02nukenote.pdf