As mentioned in the previous reply it could be the rebar being too close or it could be the the quality of the concrete or finish mix. Either way you may wish to employ an engineer that works with cement and have that person determine if the work was done properly and if the quality of the mix and construction was up to spec. If not then you may need an attorney to have your pool rebuilt.
One question you may wish to ask the engineer is for the type of mix used in the concrete how long should have been the cure time and was the concrete protected from strong sunlight and sprinkled for the correct amount of days and times for that particular mix. If not it may not have hardened to its correct strength and protection. If the final coat was applied too early then this to may be an issue. You might have to get the construction date records from the builder through the attorney.
It might be a little of each.
But if you do have to go to court you may only wish to work with an attorney who works on contingency (see post on Pool builder from H**L).
Good luck.
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