I was a power lineman and working in the Irvine area and getting ready to set an hundred foot steel pole. Forty feet of it went into the ground. While digging the hole with a well digger we broke through the ground and there was a rushing river at the bottom of the hole. Frankly it scared the heck out of me. If you fell into that no one would ever see you again. We had to dump abound 20 yards of concrete to bring it up to where we could set the pole. We set the pole and encased it in foam.