To generate a transwarp conduit the coil required a minimum input of thirty teradynes (three hundred meganewtons) of force from the ship's systems. On Borg vessels, the coils were protected by a protocol that damaged the coil beyond repair by fusing the field regulator when the vessel became critically damaged. (VOY: "Dark Frontier") In 2153, the two researchers Rooney and Drake discovered a transwarp coil from the wreck of a Borg sphere that crashed in Earth's Arctic Circle. (ENT: "Regeneration")