If we compared with surface core drilling, underground drilling condition is much harder, the space is narrow, the drilling angle is horizontal or normally there go for inclination angle holes, so it requests a much stronger drill rods and core barrel loading system. Our AU series BTW, NTW and HTW can be competent for such work. Also we can provide you one-stop package services, give you a recommendation how to combine such tools together to work properly. Help our customers to get high efficiency performance goal is our commitment. Contact our sales representative for a free consultation for your project now!