Well the cave is cleaner now than it has ever been. I did not have to pressure wash my kit. Interesting as the cave ( if that is what it is ) was sealed with 7m of loess blown in to the closed basin 15,000 years ago. To help the farmer we have created a " French Drain " feeding flood water from the depression into the pipe. ( OK I admit it has been done on purpose ). Prior to that the depression would flood creating collapse into the loess. Now that the water has a conduit it flows through much of the excavated cave gradually washing out ancient sediments and gravels.The small streamways converge on the terminal scaffolded choke to sink down a hole in the floor following the bedding steeply down.