Last night, I was combing through Youtubes on the Fordow attack, and, as usual, 97% were some guy without much background blathering. One, however, caught my eye and it dovetails with the additional information released this morning. This guy purported to have both a military background and also in nuclear engineering. He said that thousands of centrifuges running generate heat and a lot of it and that makes a lot of sense, when you think about it. He said that the two ventilation tunnels were each several meters in diameter. I was thinking much smaller. He went on to analyze the "spoil" around the entrance holes, even hitting the point that the white deposits around one indicated that concrete had been hit. He said that the grouping and the size of the entrance holes indicated they had dead centered each shaft. He said that it wasn't necessary that they penetrate all the way to the operations area, the shockwave would have been enough to wreck the interior. I'm now a lot more optimistic about the attack itself. Of course, none of this bears on other factors like the amount of material removed before the attack, the Iranians' claim that they have a new, untouched, facility, etc...