While visiting Iran last week, the IAEA chief, Rafael Grossi, asked the Iranians to explain the construction disclosed by Mr. Albright’s group, known as the Good ISIS. “We’re asking them, ‘What is this for?’ They are telling us, ‘It’s none of your business,’” Mr. Grossi said at Washington Wednesday. Tehran’s foreign minister, Abbas Araghchi, has dismissed the Good ISIS discovery as a product of war mongers. “The attempts by the Israeli regime and certain Special Interest groups to derail diplomacy—using variety of tactics—is abundantly clear for all to see,” he wrote on X Wednesday. “Those seeking to manipulate public opinion can also be expected to come up with fantastical claims and props like scary-looking satellite images,” Mr. Araghchi, who leads the Iranian team of negotiators, writes. “Reality check: Every single milligram of enriched uranium in Iran is under full and constant IAEA supervision and monitoring.” As seen in the satellite images, the tunnel is directly next to the Natanz nuclear facility, which Iran allows the IAEA to inspect. The newly discovered construction, though, possibly leads to a secret installation under a mountain near that plant. “It’s completely obnoxious that they say it’s none of your business,” Mr. Albright says.