“Israel mistakenly believed, the Times of Israel reported, that Hamas would never be able to get past its high-tech border security — an “Iron Wall” composed of concrete, tunnels, and razor wire, complete with remote-controlled machine guns, that was installed two years before the attack.
That oversight prevented top Israeli intelligence leaders from doing anything about the internal report detailing Hamas’ plans, Kan News reported.”
https://www.yahoo.com/news/israeli-military-knew-hamas-planned-211718864.html