I need information from anyone who can help. I have property in northern Mindanao (near Butuan City), I have dug two separate times. The most recent in 2013. I had lots of help to dig, wood bracing and a water pump. I began hitting dark soil at about 8 feet. At about 10 feet or so the small cement shapes began to appear. By the time we reached 25 feet, we were bringing up large cement shapes and odd looking stones. Unfortunately a large rain storm hit and my water pump was unable to keep the hole from filling with water and collapsing. Has anyone had a similar experience. Can anyone assist with explaining the cement shapes found so deep under the ground. Also used "feelers". This is how I describe a long thin metal rod with a wood handle at one end that we would shove deep into the ground below where we were digging, in hopes to hit something solid below. This would give us motivation and encouragement to continue digging. We would hit something solid and keep digging. When we reached the object, it always ended up being a piece of cement.