Hag fish have a mostly cartilaginous skeleton. How do they get enough force to tear flesh from the grey whale carcass?

Answer:Once a firm hold is established on the prey, the hagfish ties and untied a knot within its own body to create a ripping force. It then burrows into dead carcasses exposing its skin to the nutrient-rich decomposing matter while eating away at the dead animal's inside. It leaves the skin and bones behind.