“But speculation is fun.”
Isn’t it though!
When I think about flooding the tunnels in Gaza I see the ground slumping down over a period of years and buildings starting to lean this way and that. This slow destruction gives the populace time to scuttle to safer ground as the buildings slowly reach the tipping point and fall over like Chinese high rises. Children crying and women wailing in the background as men yell and scream. Delicious!
Yes, I’m sure the IDF equivalent of the US Army Corps of Engineers is well aware of the results of flooding the tunnels. It is their bailiwick after all.
Leaning towers of Gaza.
My former prospective father-in-law was a civil engineer in southeastern Virginia (Virginia Beach). Beautiful area, but all the large buildings sit on piles driven about 300 feet in the ground. I suspect that Gaza would recover, regardless, but hunkering down in tunnels like those is militarily suicidal. All it does is spare you from the immediate effects of artillery and airstrikes. Eventually you have to come up and defend the entrances and ventilation system or die.