Taggings of great whites are the first in the Atlantic Ocean , state officials say . Beaches in Chatham , Massachusetts , closed after shark sightings . Watch who is making money from sharks » . Comment: Tags will let scientists track the two sharks .
Taggings of great whites are the first in the Atlantic Ocean , state officials say . Beaches in Chatham , Massachusetts , closed after shark sightings . Comment: Tags will let scientists track the two sharks .