ACCESS AND VENTILATION
SDI is providing the global market with shafts approaching 20' (6m) in diameter and 2000' (600m) deep. This unrivaled expertise is used to meet the growing demands for larger diameter ventilation and access shafts for sewer systems, tunnels, infrastructure, and raw water intake.
Small Diameter Shafts
SDI's small diameter shafts provide underground operations with the shortest possible route for utilities, such as electrical power, pneumatics (air) and communications.