Abstract: A ditching machine for digging a ditch for submarine cable comprising at least a plurality pairs of blades disposed along the longitudinal direction of the ditching machine. At least the blades in a forward position have a ditching portion which ditches soil and a soil-pushing portion which pushes away the soil thus ditched substantially horizontally in a direction lateral to the moving direction of the ditching machine. Said soil-pushing portion is at the top of said ditching portion and has a wider horizontal width as seen from front of the ditching machine than that of said ditching portion when the ditching machine is in a normal operating posture.