We had a different company close the pool this year. We had an especially harsh winter - one of the coldest ever. Checked on the pool yesterday and there is no water in the pool - zero, none. We have an in ground 16'X40' pool. I fear thousands of dollars. What could've happened and how do I trouble shoot? We do have a vinyl liner but doubt it's a tear because all the water leaked out. The tear would have to be next to the drain. Could it be human error on the closing company? What's the best case and worst case scenario?