SINK HOLE ??

Welcome to TFP.

There are all different ground conditions people encounter. If you had a 24' in that location for a while the ground must be pretty stable.
 
Hiya hyam and welcome. Pics and more info would help. Is the hole where the old pool was, or where you expanded into new territory? Was the new pool perfectly centered upon the old spot with a 3 ft bigger radius all around, or does it start at the same spot and hang 6 ft longer at the far side ?
 
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