When the going gets tough in slurry wall applications, then cutting takes over from digging. Like a knife through butter - the innovative slurry wall cutter LSC 8-18 from Liebherr. http://www.liebherr.com/HS-series | Liebherr Construction

Slurry wall construction is a ground support and groundwater control method that involves excavating a trench and filling it with a bentonite or cement-bentonite slurry to form an impermeable barrier. Unlike diaphragm walls, which are reinforced structural elements, slurry walls are primarily constructed as cut-off walls to reduce groundwater inflow and prevent soil erosion during deep excavations or tunnelling works. The slurry in the trench stabilizes the excavation until the trench is backfil