During the recent outbreak of fighting between Israel and Hamas in Gaza, many of the Israeli strikes targeted Hamas tunnels. That raises a range of important questions. What advantages do subterranean environments lend to combatants? What military challenges do tunnels pose? More broadly, why is underground warfare occurring increasingly frequently? Dr. Daphne Richemond-Barak—author of the book Underground Warfare and creator of the International Working Group on Subterranean Warfare—joins this episode to discuss these and other questions about the subterranean dimension of urban warfare.