new guy with a big problem

Ok I have a inground pool with a liner
The liner was shot so I order a new one.
So I take the old one out and I noticed water under the liner in the deepest part of the pool anyhow I remove the line and I find a hole in the Shell and there is none stop water so I'm guessing it's a spring .
So I'm lost as to what I need to do.I have machinery if I need to dig. The the pool is filling up to about two feet and it stops so I'm thinking its the water table .What should I do ? Dig down and away from the pool where the hole is and divert the water and fix the hole.also this is not concrete it looks like sand of some sort.

Thanks