There's indeed a lot of transport happening in plain sight,

https://www.twz.com/news-features/u-s-has-attacked-irans-nuc...

> "Prior to tonight’s airstrikes on the three Iranian nuclear-associated facilities, Maxar collected high-resolution satellite imagery on June 19th and June 20th of the Fordow fuel enrichment facility that revealed unusual truck and vehicular activity near the entrance to the underground military complex. On June 19th, a group of 16 cargo trucks were positioned along the access road that leads to the tunnel entrance of the facility. Subsequent imagery on June 20th revealed that most of the trucks had repositioned approximately one kilometer northwest along the access road; however, additional trucks and several bulldozers were seen near the entrance to the main facility and one truck was positioned immediately next to the main tunnel entrance."