7. Basking sharks
Imagine going on a diving run, everything is pretty, silent and blue, and then you see your fellow diver panicking and pointing behind you. You turn around and see this coming towards you. I don't know about you, but I'd probably get a heart attack right away. In reality, basking sharks are more interested in zooplankton than you. It's pretty tame and tolerant to both boats and divers.
