I was surprised at how many Pacific green sea turtles we saw in the Galapagos Islands. We snorkeled almost every day and almost every time we got in the water we saw a few of these guys. I got plenty of shots at close range of them staring into the camera, but I really liked this one of the turtle surfacing for air amidst the the diffused rays of the sun.
Nikon D800 with Nikkor 17-35mm lens (at 22mm) ISO 320, f/5.6 at 1/800th of a second, Ikelite underwater housing with 8-inch dome port