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Ah, I should clarify what I meant. Lots of people have wireless transmitters on their first stage, on top of their tanks, and I've not heard of other stories of sharks being interested. In this case, it seems like the shark was very interested. In the story of Marco and the embarrassed great white, he had some electronic gizmo and there is speculation that this could have caught the shark's interest in a different way. So, could it be that the diver in this case A) had a wireless transmitter on top of the tank and B) it was emitting signals in some way (different from what they normally do) that caused the shark to say "Hey, this is interesting/annoying; I think I'll check it out, and since I'm a shark my mouth is how I check things out."
Of course this is just baseless speculation on my part.
maybe it's just me, but the first time a shark bites anything of mine, i'm hitting it or, at the very least, making sure i can see it approach a second time... I'm not taking any chances! I think i'd do the same if it happened to my buddy. Sharks passing closer and closer to something is part of their "food determination" process, as i understand it. That second pass would have had me back to back with my buddy and moving out of the water as soon as possible, research be damned.
I'm not afraid of sharks generally, even big ones that have a "reputation" but when they exhibit that kind of behavior, it's time to get out of the water and return to the top of the food chain.