Hello! I am looking for any suggestions on what could possibly be the easiest or likely cheapest approach to fix this problem. We have an inground pool right outside our back door that was built around 1990. It is kind of built into a slope and one end is elevated above grade I guess you would say? One corner of the pool wall on that end is sinking into the ground falling away from the concrete and ground is eroding beneath the liner. We had this problem fixed once when they thought it was just from settling and they added a metal panel to that corner, leveled the floor, reset the liner, re-did the concrete. 9 years later and it has slowly been sinking leaving a huge gap. It is really hard to explain what is going on here so I have attached photos.. Is it possible to change the shape of the pool, adding a new wall that by-passes the problem area and basically cuts off that corner? Make a smaller pool inside of the area we already have again, bypassing the area? I know filling the pool in is an option but I really want to avoid that since this pool area is basically our back deck with it being elevated.
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Shame it has to be under such circumstances. 
This is probably not an easy remedy. The base support is obviously compromised, either by a natural (high) water table, water run off from the slope, and/or perhaps even a leak from the pool over time. Somehow the support is compromised and you may never know why unless it is pulled apart and inspected. I can't think of an immediate remedy short of excavating the soil in that area and inspecting the supporting base.
