From Ynet:  ”A drawing provided to The Associated Press is said to come from inside an Iranian military site and to show a structure used in secret work on nuclear arms.

The image shows the type of explosives containment chamber needed for such tests that UN inspectors suspect Tehran has conducted at the Parchin military site. Iran denies such testing and has neither confirmed nor denied the existence of such a chamber.

The image was provided by an official of a country tracking Iran’s nuclear program who said the drawing proves the structure exists despite Tehran’s refusal to acknowledge it.

A former senior UN official said he believes the drawing is accurate.”