With the increase in development work of hydroelectric projects in India, the quantum of tunnelling work has increased manifold. Besides to achieve time bound programmes of construction of mega projects in a period of four to five years, modern methods of tunnel driving are being considered as only solution to achieve a high rate of progress. In 1980s a progress of 75m per face per month was considered as a high rate of progress whereas nowadays even 150m per face per month is not considered as a good progress.The only solution to achieve a time bound programme of tunnel excavation in long reaches is use of Tunnel Boring Machine (TBMs).

SEW has extensive experience in tunnelling and underground structures in every kind of ground condition, from the hardest rock to softest soils. The company has found a high quality, cost effective solutions enabling the customers to accomplish the most challenging tunnel projects. Ranging from largest water transfer conduits to smallest micro tunnels, the company's unique blend of specialist skills helps to provide a complete unified service in all aspects and stages of the project lifecycle.

SEW has earned a leading reputation in construction of Main access tunnel for Allain Duhangan Hydro Electric Project and Tunnel including head regulator and approach channel for Veligonda Project.