Without actually being there it could be as you say. If the case that the bottom is soft sand or mud, a standard river dredge in a day or so could pump out the furrow walls on both sides. If it is bed rock and rubble likely not.I'm pretty sure it cut into the canal all and bottom like a plow. The hull displaced material riding on top/compressing some but primarily piled the farrow's displaced material along the port side. In essence, it created a berm that prevents moving the bow sideways. It has to be freed in a aft/reverse direction that the hull already transitioned over.