"The investigation also reveals how Israel has known for years that the use of bunker-buster bombs releases the lethal gas carbon monoxide as a byproduct, which can kill people inside a tunnel through asphyxiation even at a distance of hundreds of meters from the strike location."
They needed to set things up so that Bibi can finish the job.
Ray McGovern : What Mossad Tells Netanyahu.
https://www.youtube.com/watch?v=apeTSmKG8Ew
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Bomb the area, gas the tunnels: Israel’s unbridled war on Gaza’s underground
https://www.972mag.com/tunnels-hamas-lethal-gas-bombs-gaza/
"The investigation also reveals how Israel has known for years that the use of bunker-buster bombs releases the lethal gas carbon monoxide as a byproduct, which can kill people inside a tunnel through asphyxiation even at a distance of hundreds of meters from the strike location."