Fighting Under the Earth: The History of Tunneling in Warfare - Foreign Policy Research Institute

Tunnel warfare - Wikipedia

The Elephant in the Tunnel: Preparing to Fight and Win Underground - Modern War Institute

Ukraine's Offensive Operations: Shifting the Offense-Defense Balance

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How Tunnel Warfare Has Evolved Over the Last 3,000 Years, in Photos

NASA Glenn History Office - NASA

Hamas' Secret Tunnel Network Complicates Israel's Gaza Ground Invasion Plans - Bloomberg

The Chinese railroad workers who helped connect the country: Recovering an erased history

Israel targets Hamas's labyrinth of tunnels under Gaza

Orion Magazine - Dark Ecology

Arctic Competition – Part One – Foreign Policy

Fighting Under the Earth: The History of Tunneling in Warfare - Foreign Policy Research Institute