In recent times the need for underground space has increased for various purposes like tunnels, parking, and railway stations, etc. Deep excavations are required but in congested cities nearby structures may experience structural problems.

The diaphragm wall technique is an effective and reliable construction method, which provides good hold up for existing foundations in congested areas for existing structures in close proximity. It aids in problematic dewatering and excavation support by acting as a cut-off barrier and retaining wall of underground structures like metro stations.