Why the tunnels under Gaza pose a major problem for Israel's

The widespread underground tunnel system in Gaza is designed to conceal and cover Hamas militants and execute surprise attacks, experts say.
ABC News’ Linsey Davis spoke with warfare expert and Reichman University Assistant Professor Daphné Richemond-Barak about the intricate Hamas tunnel system in Gaza.

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Video: Hamas boasts vast tunnel network beneath Gaza

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See inside the biggest Hamas tunnel Israel's military says it has

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Getting From Gaza to Israel, by Underground Tunnels - The New York