Drill Tech Drilling & Shoring, Inc. (DTDS) is a full service Engineering Contractor founded in 1994 Specializing in tunneling, shafts, deep foundation, ground improvement, and earth retention with offices in Antioch & Corona (CA), Colorado, Texas, Kansas and Maryland . DTDS maintains a staff of experienced, registered professional engineers and experienced tunneling mangers who specialize in the design and construction of infrastructure projects. Drill Tech's fabrication shop gives us the unique capability to design and build equipment to fulfill a unique project's needs.