So far, I’ve found this on WaPo, but you asked for quality reporting.
https://www.washingtonpost.com/world/2023/10/27/hamas-attack-israel-october-7-hostages/
.....
“Israeli Prime Minister Benjamin Netanyahu had boasted for years of multimillion-dollar investments in an expansive “smart wall,” running the length of the enclave above ground and extending deep into the ground.
Claiming in recent years that Hamas had been successfully contained in Gaza, Netanyahu oversaw the gradual withdrawal of troops from the south. Forces left behind at the military and intelligence bases were trained to rely on sophisticated cameras and sensors to monitor for border infiltrations, and to alert forces on the ground in case of unusual events.
How Hamas’s carefully planned Israel attack devolved into a chaotic rampage
But in the early hours of Oct. 7, at least 1,500 Hamas and Islamic Jihad militants broke through some 30 points along the border barrier. They overran some bases so rapidly that soldiers were killed in their bunks, and the militants took out communication networks so efficiently that the area became a blind spot for the military.
“They coordinated it, in sync, to get the maximum impact,” Hulata said. “The fact we failed doesn’t mean the IDF isn’t prepared to respond,” he added.”
.....
Thanks.
“...the militants took out communication networks so efficiently that the area became a blind spot for the military. “They coordinated it, in sync, to get the maximum impact,”
Sure sounds like there was *someone* on the inside providing electronic technical details.