leave here. >> reporter: we head back half an hour underground, we've seen only a fraction of this war changing labyrinth. his challenge, find all the others. and i think the takeaway are from that has to be that there is no fast when you're fighting what he's described as fighting a war that's like a rubik's cube where you can shift it at every dimension and pieces move. how to figure out how to force hamas to come out of a tunnel in one place, how to know that they're not going to come out of a tunnel behind you somewhere else. how deep do you go in those tunnels. how dangerous it is for the troops when you put them in those tunnels. all of that makes it complex. when secretary blinken was here and he spoke about this u.n. commission o'coming into gaza to figure out when the conditions for palestinians to be able to mauve back to the north of gaza, back to their homes from where they're condensed in the south of gaza right now, you really