CNN doesn't question the existence of the "seemingly endless" tunnel in the immediate vicinity of the cemetery. They don't question running water, electricity, maps, multiple rooms inside the tunnels. They don't question accounts of havy fighting between Hamas and IDF in the immediate vicinity of the cemetery. As far as the CNN report is concerned, all these questions are pretty much settled. That's a hell of a lot of questions answered!
Call me strange, but when I find no reason to question the presence of tunnels, the signature Hamas military asset, in a combat zone immediately adjacent to a cemetery, an IDF general "failing to prove" that the tunnel runs underneath the cemetery during a three-hour tour of the area is the last thing that comes to my mind.
The first question that does?... What the actual fuck, a Hamas tunnel next to a cemetery and a mosque? The second question?... Who the fuck Hamas militants think they are, creating a war zone out of a protected area? The Third question?... No I have no more questions. Certainly none about how many meters away from the cemetery the entrance to the "seemingly endless" tunnel is, or how inconsistent an Israeli map of the tunnel is with momentary recollection of a press tour guide.
Judging by the report, there are only two questions that the visit to the site raised: whether or not the entrances to the tunnels the reporters observed actually lead to the tunnels directly underneath the cemetery, and whether or not the IDF spokesman's recollection of the location of Hamas underground headquarters is consistent with the IDF map. And raising these two questions is more than the answers they got answered... how?
And it is not up to IDF to provide proof of anything to journalists. It is the journalists' job to find proof. And not whine about a military spokesman failing to do their job for them.