are. allison koch is a marine biologist studying the effects of cage diving on the feeding habits of great whites. koch is tagging great whites with darts attached to transmitters. she can then track the shark's movements around these waters for months. >> keep it there, keep it there! tagged! >> reporter: she's tagged over 70 sharks so far. the data she's collected led to the only peer review study on the effects of cage diving on shark behavior. >> the study we did showed a surprising result in that the sharks, most of them stopped responding over time to the boats. >> so you don't see any connection between increased shark attacks in this area and shark tourism? >> no. not at all. all the evidence that we have at the moment finds no link between chumming and shark attacks. we're definitely not on the sharks' menu.