How to cut the top rotten a fiberglass pool? We've got this inground pool that we want to just cover next...

We've got this inground pool that we want to just cover next to dirt but the top of the pool is too high. So we need to trim bad the top edges. It's fiberglass. What is the best, safest, cheapest way to do this? Thanks!!
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Make sure you knock a couple of holes in the bottom ensure your not creating a drizzly land... Make that some LARGE holes in the bottom.