Heat84 I thought the IDF systematically went through Gaza(Including the tunnels)
This was discussed in-depth in the thread on the old site, but suffice it to say that the Iranian terror proxies held hostages in homes, businesses, and former healthcare facilities.
I have not had a chance to read much on any information that might have come out of debriefing formerly held hostages, but that might be useful if any of that info has been released.