“Gently, Willis and his family led the woman with them to the first floor. The garage was flooded. They lifted the woman over a wall that had collapsed near the pool, and over a stretch of broken tiles. “At the moment, [focusing on saving the woman] takes your mind off it,” Willis said. “There is something else going on. When they got to the bottom floor, they found it had sunk at least three-four feet. There were chunks of concrete. There was debris”..
We will have to wait for the failure analysis. That will take months.
At this point anyone offering a hypothesis is engaging in pure speculation.
L