Iran took a group of reporters underground today into the heart of a nuclear plant which the U.S. wants permanently closed and whose existence was a secret until 2002. About 30 local and foreign journalists visited the Natanz uranium enrichment facility, 250 km south of Tehran, the centerpiece of Iran's disputed atomic fuel drive. Iranian officials said the builders placed the uranium enrichment facility more than 18 meters below ground for security reasons. International Atomic Energy Agency inspectors first visited Natanz in early 2003. In October 2003 the UN watchdog sealed Natanz's pilot enrichment facility, as part of an agreement between Iran and the EU. The EU now wants Iran to scrap Natanz and other nuclear fuel work in return for assistance with developing nuclear energy and other economic and security cooperation.