Israel has purchased two more German-made Dolphin submarines capable of carrying nuclear warheads. The new submarines, built at a cost of $1.3 billion with Germany footing one-third of the bill, have diesel-electric propulsion systems that allow them to remain submerged for longer periods of time than the three nuclear arms-capable submarines already in Israel's fleet, the Jerusalem Post reported. The latest submarines not only would be able to carry out a first strike should Israel choose to do so, but they also would provide Israel with crucial second-strike capabilities, said Paul Beaver, a London-based independent defense analyst. Israel is already believed to have that ability in the form of the Jericho-1 and Jericho-2 nuclear-capable ballistic missiles, which are buried so far underground they would survive a nuclear strike, he said. "The Iranians would be very foolish if they attacked Israel," Beaver was quoted as saying by the Associated Press.