This was the missing piece. In the hours before the attack, Iran essentially entombed Fordow, using bulldozers (first seen by @Maxar on June 21) to cover its entrances with dirt.

This hole that mera points out is almost 10 feet/a little over three meters. Which makes it the smallest crater generated by US strikes on Iran, so far. It's definitely a crater from a strike, but not convinced it's a crater from a GBU-57 at the moment.

What was hit by the US at Natanz? A 2003 image from when @Maxar was known as DigitalGlobe lets us see. The second image, shows what the Iranians built underground at Natanz. And it shows the second crater was targeting a second underground section of that facilities there.

How did we get from a bit of remote land in rural Iran to the US bombing what's now the Natanz Nuclear Facility? Construction began in April 2000. Imagery from the since decommissioned Landsat 7 shows us the construction of the project over time.

Fordow is dramatically different from Natanz, where the Iranians constructed an underground structure and then buried it. All of the construction at Fordow, as seen in Landsat 7 images, was underground. And it was very, very deep. Hence why the US engineer the GBU-57.

Digging further into the archival Maxar QuickBird imagery, a rough layout of the visible underground infrastructure at Natanz appears (in green). The strike locations are in red. Notably, the entrance building to these has not yet been targeted by a strike.

.BlackSky IDs additional damage at Isfahan Nuclear Technology Center, likely from US Tomahawks. The images are taken by their new Gen-3 sats (35cm), so can see a lot more detail. Have to wonder what was so important about the building the US hit at 32.583, 51.824