and it's about 250 feet NE of the house. Anyone know anything about this? Would this explain why the dumb sump pump runs all the time? Is this bad? It looks like someone filled it in with rocks a long time ago and now it's wide open. Part of me thinks it's awesome, and the paranoid part wonders if the house will sink in 15 years. It was not visable at all last year and now it's open about 6 ft. long, 3 ft wide and probably 2 ft deep (in the part that's open). Now what?