Mum's the word. Military experts and anonymous sources have revealed a link between the U.S. and Israel—and possibly the British and Germans as well—in creating the computer virus credited with delaying Iran’s nuclear program. The Dimona facility, located in Israel's Negev Desert, is well-known as a heavily guarded, but never publicly acknowledged, nuclear arms program. It also allegedly came to contain the same 1970s model centrifuges used by Iran. Experts say that in the past two years, the U.S. and Israel worked to create the Stuxnet cyberworm, a virus designed cause centrifuges to spin so fast they self-destruct, testing them in Dimona. Stuxnet, regarded as the most sophisticated cyberweapon ever deployed, was referred to by both Secretary of State Hillary Clinton and retiring chief of Israel’s Mossad intelligence agency, Meir Dagan, as the reason for a delay in Tehran's nuclear strength. Dagan said in recent days that the country won't have a bomb until at least 2015.