Hello all. I'm looking for help with our pond of about 15 years or so and I'm hoping we're not the only people on the planet who've had this experience. Here's the situation: We live in Wisconsin and have a straight-sided pond that's about 8 ft x 9 ft x 2 ft (I'm guessing on the depth). It has a rubber liner with two sides covered by rock wall. Our goldfish overwinter in the pond with the help of a pond heater and an aerator. We've had no problems with the pond until last year. Last winter the pond level dropped precipitously over the course of a few days. We refilled it and several days later, the pond had emptied except for a couple of inches of water at the bottom. That's maybe 1000 gallons of water that disappeared over the course of about a week. You'd think that much water on the move would be quite apparent. And yet, there was no evidence of it. I sadly unplugged the pond heater, but left the aerator running, prepared to net out a school of desiccated fish and not looking forward to replacing the liner. A heavy spring rain filled the pond. When the ice cap thawed, the fish were still swimming (!!!) and the pond held water (!!!). We dubbed it the miracle pond. I mean, fish surviving several months of winter in just inches of water. It shouldn't be possible. Nor should the pond have held water. Fast forward to this winter. Our trusty pond heater and aerator are in place again. The pond is frozen over except for where the heater is and, ominously, the water level is starting to drop again. So here's my question: Does anyone have any thoughts about what's going on? Many thanks for your help.