Hello everyone. I'm back with a signature and photos. It is a unique pool. Half above ground and half in ground. It has 3 pumps, one for filtration, one for some massaging jets, and one to operate a fountain above the water level that spills into the pool. They are all three plumbed so that they can divert their flow through the six main jets at the end of the pool for in-place swimming. Meaning that all 3 pumps can draw from the main drain. The main filtration pump draws water from the skimmer line, which is separate from the main drain. If I plugged the main drain, I'm not sure I could preserve the function of all three pumps just by using skimmer line water. I believe that is why the pool was designed with these two drains at the bottom. I believe one of these three drain lines broke under the pool somewhere and allowed the water to leak out overnight. Maybe the low one in the photo? Anyway, it's quite a problem. I would appreciate your thoughts on how to repair it.