Turn- Key Tunneling, Inc. is a privately owned company based in Columbus, Ohio that specializes in trenchless technology services. Founded in 2005, Turn-Key Tunneling has completed over 100 projects and has quickly become an industry leader throughout the Midwest. If you have the need for trenchless excavation, then you need to enlist the services of Turn-Key Tunneling! Services Include: ¿Installation of 8" to 84" steel casing pipe utilizing traditional auger boring method ¿Hard rock boring utilizing Small Boring Unit (SBU) Technology ¿Installation of tunnel liner plates structures utilizing traditional tunneling methods ¿Vertical shaft construction using shaft liner plates and hand/machine excavation ¿Slip-Lining to restore damaged or failed sewers