2. try not to disturb the water in the area with the drilling, because that water is causing holes and mouth holes to tumble down because there will be a drill opening for blower cutting up with water up to make the not-quite-taek or collapsing strength in hole, making a hole. The position of the hole punch and depth, it'll update the level of the job by the survey data, it will be used in a design by drilling to drill a 9 m provision for drilling holes drill 1 m sub is the direct use of drill head approximately 4 inches of penetration rate 18-30 meters per hour.
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