Equipped with a permanent measuring and control system, any deviation from a vertical excavation direction can be immediately detected and corrected with the hydraulic diaphragm wall grab HSWG. This ensures high accuracy even at greater depths (> 50 m) and perfects the production of diaphragm walls with grabs. The hydraulic diaphragm wall grab operates without noise and vibration and is much easier to operate. The HSWG type is equipped with verticality measurement and control system including measurement data recording (patents in many countries). The HSWG XY 360° is additionally equipped with a torsion control system.