One tunnel in the Gaza Strip was wide enough for a top Hamas official to drive a car inside. Another stretched nearly three football fields long and was hidden beneath a hospital. Under the house of a senior Hamas commander, the Israeli military found a spiral staircase leading to a tunnel approximately seven stories deep.

These details and new information about the tunnels, some made public by the Israeli military and documented by video and photographs, underscore why the tunnels were considered a major threat to the Israeli military in Gaza even before the war started.

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But Israeli officials and soldiers who have since been in the tunnels — as well as current and former U.S. officials with experience in the region — say the scope, depth and quality of the tunnels built by Hamas have astonished them. Even some of the machinery that Hamas used to build the tunnels, observed in captured videos, has surprised the Israeli military.

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