Since the October 7, 2023 Hamas terrorist attacks in Israel, John Spencer has conducted research during seven trips to the country, and has had the opportunity to visit Gaza City. His firsthand experience gives him a deep and nuanced understanding of the vast tunnel network that runs underneath Gaza. In this episode, he shares his observations from this research. He also describes the ways Hamas has employed subterranean spaces to move personnel and materiel, produce and store weapons, hold hostages, and protect leadership. And he explains why he believes the tunnel network has mattered more than the fight above ground over two years of war.