welcome back to "the lead." north carolina is going to need a bigger boat. today another terrifying shark attack there. local emergency officials say a shark pulled the victim under water, biting him on the left side near the rib cage and on both hands. this is the seventh shark attack in north carolina in just a month. now, to put that in perspective, there have only been 51 shark attacks in north carolina in the last 178 years. discovery channel's shark week begins on sunday gives us a glimpse. this is not some sick marketing scheme. tom foreman is here to explain why they're stealing their own spotlight. >> people have been vigorously trying to fight these things off, yet the latest attack on ocracoke island may be the work of one shark, some speculate or similar species.