To Dr. Richemond-Barak, this challenge has not only been under-explored, it is also largely underestimated by the community of states, security experts, and public opinion. She analyzes traditional concepts of the laws of war as they relate to tunnels and underground operations, contemplating questions such as whether tunnels constitute legitimate targets, the assessment of proportionality in anti-tunnel operations, and the availability of advanced warning in this complex terrain. She also identifies issues that are unique to underground warfare, including those that arise when cross-border tunnels burrow under a state's own civilian infrastructure.