"Galapagos: Realm of Giant Sharks" is a nicely filmed and interesting documentary about the whale sharks that inhabit the waters around the Galapagos islands. And, because diving conditions are rather treacherous there, it's probably your best way to see these creatures. In addition to excellent footage of Whale Sharks, you also see quite a bit about the Hammerhead. Overall, an interesting and amazingly well filmed documentary.

I had to give up after five minutes. Not only was the background music terribly annoying it is so loud I can't hear the narration. So many educational videos with the problem.

Less than 10 minutes in there are some significant things the narrator says wrong. First he says the whale shark is the largest fish to ever exist, which, no. Everyone knows about the megalodon, and there were probably other ancient sharks bigger than the whale shark. Them he says that sharks have bones made of cartilage. If they're cartilage, they're not bones. Maybe that's pedantic of me but that seems like something w documentary about sharks should get right.