No way Hamas could've done this in Gaza unnoticed. Our satellites would've picked up the heavy equipment needed to do something like this. Too many eyes would've also seen the equipment moving and as someone else pointed out: where would all the material that was excavated be dumped if this was in Gaza?
Which then begs the question: how did Iran move all the heavy equipment needed to build this facility into a mountain and how did that go unnoticed by our satellites???
I am sure that the spy satellites see many things, the question is, are we seeing it and is it being reported or is it be withheld?