It is not what I found in the pool, it is what I found under the pool! I guess a Mole got under the vinyl liner in the winter and there is just a giant hole under the liner now! It kind of sucks because when I bought my pool I got two cards for two guys that installed pools. I called both guys and the one guy said that he would put a Mole tarp down under the liner, it was $200 more, but he said it was worth it. I winded up going with the other guy and I forgot to mention the Mole tarp and now I sit with a big Mole hole! I kind of wish now I went with the other guy, but I asked the pool company with who they would use and I went with the guy they said! Really not a big deal, but it does bother me, I guess I am going to drain the pool this fall and fix it! I think if I do that I might just replace the liner considering that next season will be the 4th season, but I will see how it is doing when I drain it!