the shark is there. get out of there! bill: a thought he was going to say, lets get out of here, he said let s get over there. martha: over there! bill: the national geographic channel takes us to see the houdini like tactics of the seals to avoid the ultimate killing machines. martha: the next guest is our lead scientist on the boat, ryan johnson, a marine biologist and a great white shark expert. whoa! those are amazing, amazing pictures. how big is that shark. the shark, is massive, we saw 14, almost 15 foot sharks. martha: they eat seal all day long. they have a good food source. bill: seal island is where. a little bottom point of south africa, a little island with 70,000 seals packed on it. and you can imagine the. bill: 70,000.
also the seal population is huge in this area. i came back from this area last night and there s lots of seals and the population has been growing a lot. you may remember last summer, five great whites were spotted off the coast of chatham. there s a seal population in that area and the coast guard is saying you need to be careful, when you re swimming the waters and they always tell people don t swim near the seals. people like to swim near the seals. that s lunch if you re a great white shark and a great white shark expert is going to join us and tell us how concerned we should be about this shark threat that is looming in the waters out there. rick: and we need to talk to this expert. last summer the seals went away and everybody like where did the seals go and they left because the sharks came in. now the seals are back. we ll see what that means. the troubling case of a missing seven-year-old, how his stepmom may be connected to the case. we ll tell you. martha: this is an unn