If so many different species of shark will do this, the behaviour pattern is likely wide-spread among them. Curiosity that is not based on a biological need is a sign of intelligence, and in this case is apparently linked to a wish to socialize. In each case the approaching shark looked at me (or any object of interest) with one eye first, then on the next undulation, the other.
A powerful communication passes through a shared gaze in eye contact, and it seems important to sharks, given this common behaviour with divers, as well as to us mammals.
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