well to realy solve the problem in my case. i would figure out the diameter of the money pit and lay stiel pipeing or walling around the excuvation area. that way when you dig. you can aline the stiel walling or a single piece of stiel pipeing int the whole ware you digg. an you can dig more easley without the worry of water leaking in. an it will be alot easyer to excuvate the dirt and simply repeat the proceses untile you get to your required destination of depth...