Various news outlets are reporting
this story, about Iran taking their nuclear development underground (literally):
[the report] said that Iranian supreme leader Ayatollah Ali Khamenei had personally ordered the facility built last month near the uranium enrichment site in Isfahan that is under UN observation.
The tunnel [...] is intended to house a production site for large amounts of uranium UF6 gas which can be enriched in gas centrifuges - a key step in the building of a nuclear bomb.
The report will be published by Der Spiegel, a German weekly magazine with a decent reputation.
The problem I have with this story is that it cites "unnamed intelligence sources". I've become wary of all the sudden stories about Iran's evil ways, like Powell claiming they are clearly building the bomb, etc. I wouldn't put it past Khamenei, but the timing is all just suspect.
As they say:
DEVELOPING...