My money is on "empty". Without the weight and pressure of the water I could see this happening. In fact, I think it is one of the reasons you aren't supposed to leave your pool empty.
Sorry guys, I've been a pool guy forever and back in the early 90's here in SoCal heavy rains caused several pools to pop out of the ground. One of them I serviced. It was full of water Just shows the power of water!
Now, if a pool company was doing the work, they'd be responsible...right?? But they'd also have probably drilled some well points or drain holes I guess.
I'd love to hear from the homeowners as to how long it had been left empty and what the circumstances were
In California, we would usually have the customer sign a waiver in case their pool popped. It probably wouldn't hold up in court but, you know "that's pool biz".
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