Kilduff Underground Engineering, Inc. | 1,336 followers on LinkedIn. A trenchless design firm supporting contractors, A/E firms & owners, specializing in underground construction & design | Kilduff Underground Engineering (KUE) was established in 2014 by Todd Kilduff, PE, to support contractors, A/E firms and owners. The firm specializes in underground design with a specific focus in the design, inspection and rehabilitation of tunnels with sizes ranging from 12-inches up to 60-feet in diameter. KUE is capable of designing tunnels utilizing all available technologies to excavate and support the proposed opening.