How do you open the bonnet of a opel when the cable is broken?

If the bonnet release cable is broken on an Opel, you can try accessing the latch directly. Look for the latch mechanism near the front of the engine bay; sometimes, you can reach it from underneath the car or through the grille. If that fails, consider using a wire hanger or a flat tool to manually pull the latch. As a last resort, consulting a professional mechanic may be necessary.