This is how a sea turtle sees a paddler at close range
There are a lot of sea turtles where I paddle. I often see them surfacing, getting a couple big gulps of air while looking around to then disappear underwater again.
Occasionally I startle them as they might not see me coming; they pop out from below close to my kayak.
If I am paddling slow I have the time to observe them until they spot me.
But often I am just having too much fun to even see them...