Similarly, Dagan’s critics say, the Iranians have managed to overcome most setbacks and to replace the slain scientists. According to latest intelligence, Iran now has some 10,000 functioning centrifuges, and they have streamlined the enrichment process. Iran today has five tons of low-grade fissile material, enough, when converted to high-grade material, to make about five to six bombs; it also has about 175 pounds of medium-grade material, of which it would need about 500 pounds to make a bomb. It is believed that Iran’s nuclear scientists estimate that it will take them nine months, from the moment they are given the order, to assemble their first explosive device and another six months to be able to reduce it to the dimensions of a payload for their Shahab-3 missiles, which are capable of reaching Israel. They are holding the fissile material at sites across the country, most notably at the Fordo facility, near the holy city Qom, in a bunker that Israeli intelligence estimates is 220 feet deep, beyond the reach of even the most advanced bunker-busting bombs possessed by the United States.