It's likely a joint operation, hamas for the manpower hezbollah for conveying logistics/means The most sophisticated rebuttal to this -> https://www.zerohedge.com/news/2023-10-08/no-hamas-invasion-was-not-israeli-intelligence-failure that I've read so far, is this one -> https://www.zerohedge.com/news/2023-10-09/how-hamas-got-drop-israel TL;DR usual guards got moved away to another position, a skeleton crew was holding the place and in case of bombings they need to shelter. And it was holidays. Also, series of failures. Alright. But still, an operation of that size isn't something one organizes and prepares in just a couple of hours or days, it probably took months if not years of preparation and it's unlikely to go completely unnoticed, especially within gaza where hamas is based, which is an open air prison, a den of israeli spies and palestinian prisoners, even egypt saw it coming and warned israel, but the warning got ignored, for some reason so... There's that.