The Verge reports that Google's underwater cables are under attack from sharks. According to a Google product manager, the company had to wrap trans-Pacific fiber optic cables in a kevlar-like layer to protect them from shark attacks. Sharks may be attracted to the electromagnetic field generated by these cables as sharks, like many cartilaginous fish, have electroreceptor organs.

The Verge has also conveniently has linked a video of a shark biting an underwater cable, as you can see below.