Whale Sharks

I went swimming with whale sharks near Cancun, Mexico with Manuel Lazcano. We saw over a hundred whale sharks feeding together right on the surface. The hydrodynamics of swimming with the whale sharks was quite interesting. It was almost effortless to stay next to the whale sharks when swimming in a certain spot, over the pectorial fin. Otherwise, they were travelling fast enough that it required a lot of work to keep up.
Alas neither of the photos below (by Carlos Requena) show me in the "sweet spot".