liner ballooned up!

[mfallonshultz]

Has anyone heard of this? We had flooding rain in PA recently and after this record-breaking rainfall, a HUGE air balloon formed under the in-ground liner, rose 4 feet above the water surface and burst the next day. No one knows why this happened or how to prevent it from happening again. I think air was displaced from the water table and had to find a way out....help.
M