They’ve already got them.
http://www.washingtonpost.com/world/national-security/experts-irans-underground-nuclear-sites-not-immune-to-us-bunker-busters/2012/02/24/gIQAzWaghR_story.html
[font face=Times, Times New Roman, Serif][font size=5]Iran’s underground nuclear sites not immune to U.S. bunker-busters, experts say[/font]
By Joby Warrick, Published: February 29
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In arguing their case, U.S. officials acknowledged some uncertainty over whether even the Pentagon’s newest bunker-buster weapon — called the Massive Ordnance Penetrator — could pierce in a single blow the subterranean chambers where Iran is making enriched uranium. But they said a sustained U.S. attack over multiple days would probably render the plant unusable by collapsing tunnels and irreparably damaging both its highly sensitive centrifuge equipment and the miles of pipes, tubes and wires required to operate it.
“Hardened facilities require multiple sorties,” said a former senior intelligence official who has studied
the formerly secret Fordow site and who agreed to discuss sensitive details of U.S. strike capabilities on the condition of anonymity. “The question is, how many turns do you get at the apple?”
U.S. confidence has been reinforced by training exercises in which bombers assaulted similar targets in deeply buried bunkers and mountain tunnels, the officials and experts said.
U.S. officials have raised the necessity of multiple strikes as they warn Israel against a unilateral attack on Iran’s nuclear installations, the officials said. While Israel is capable of launching its own bunker-buster bombs against Fordow, it lacks the United States’ more advanced munitions and the ability to wage a bombing campaign over days and weeks, American officials and analysts said.
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