> James M. Barrett, a former deputy director of international engineering for AT&T , said that there were 55,000 or 60,000 miles of old undersea cable made out of copper that did not have a single case of shark biting, meaning sharks prefer to snack on fiber optic cables specifically. It is believed that the electrical current in the fiber-optic lines attract the sharks, triggering a feeding reflex.

"electrical current in the fiber-optic" but not copper?