Two fast assault squadrons based in the Negev desert and in Tel Nof, south of Tel Aviv, are already training for the attack.

On a plasma screen, Shkedi will be able to see dozens of planes advance towards Iran, as well as the electronic warfare aircraft jamming the Iranian and Syrian air defences and the rescue choppers hovering near the border, ready to move in and pluck out the pilots should the mission go wrong.

Another screen will show live satellite images of the Iranian nuclear sites. The prime target will be Natanz, the deep and ferociously protected bunker south of Tehran where the Iranians are churning out enriched uranium in defiance of the United Nations security council.

If things go according to plan, a pilot will first launch a conventional laser-guided bomb to blow a shaft down through the layers of hardened concrete. Other pilots will then be ready to drop low-yield one kiloton nuclear weapons into the hole. The theory is that they will explode deep underground, both destroying the bunker and limiting the radioactive fallout.

The other potential targets are Iran’s uranium conversion facility at Isfahan — uncomfortably near a metropolis of 4.5m people — and the heavy water power reactor at Arak, which might one day be able to produce enough plutonium to make a bomb. These will be hit with conventional bombs.

In recent weeks Israeli pilots have been flying long-haul as far as Gibraltar to simulate the 2,000-mile round trip to Natanz. “There is no 99% success in this mission. It must be a perfect 100% or better not at all,” one of the pilots expected to fly on the mission told The Sunday Times.

The Israelis say they hope as fervently as the rest of the world that this attack will never take place. There is clearly an element of sabre-rattling in their letting it be known the plan exists and that the pilots are already in training. But in the deeply dangerous and volatile Middle East, contingency plans can become horrible reality.

NO nuclear weapon has been fired in anger since the American bombing of Hiroshima and Nagasaki in 1945. Should Israel take such a drastic step, it would inflame world opinion — particularly in Muslim states — and unleash retaliation from Iran and its allies. But Israelis have become increasingly convinced that a “second holocaust” of the Jews is brewing, stoked by Mahmoud Ahmadinejad, the Iranian president and chief Holocaust denier, who has repeatedly called for Israel to be destroyed.

Western Europe and the United States have been trying to persuade Tehran to drop its nuclear ambitions, using the carrot of co-operation with a legitimate nuclear energy programme and the stick of UN sanctions. But they have had no effect.

As a result, Israel sees itself standing on its own and fighting for its very existence. It got a taste of what Iran was capable of during last summer’s war in southern Lebanon. Hezbollah, Tehran’s proxy troops fighting from bunkers secretly built by Iranian military engineers, humiliated the Israeli army and rained missiles into northern Israel.

Every Israeli government has vowed never to let Iran acquire nuclear weapons. Ariel Sharon, when he was prime minister, ordered the military to be ready for a conventional strike on Iran’s nuclear programme. Since then, however, the Iranians have strengthened their nuclear facilities and air defences, making a conventional strike less likely to succeed.

“There are 24 strong batteries around Natanz, making it one of the most protected sites on earth,” said an Israeli military source. Its centrifuge halls, where the uranium is enriched, are heavily protected at least 70ft underground.

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