As an Israeli ground offensive in the Gaza Strip looms in its most devastating war yet with Hamas, one of the greatest threats to both its troops and the 2.3 million Palestinians trapped inside the seaside enclave is buried deep underground.
An extensive labyrinth of tunnels built by the Hamas militant group stretches across the densely populated strip, hiding fighters, their rocket arsenal and over 200 hostages they now hold after an unprecedented Oct. 7 attack on Israel.
