This Month in Photo of the Day: Most Popular Photos From 2009

An octopus I came across on a dive sometimes referred to as a "blackwater hang." About three miles off the coast of Kailua-Kona, Hawaii.

This photo and caption were submitted to the 2008 International Photography Contest. See photo galleries, play jigsaw puzzles, and download wallpaper of images from more than 105,000 submissions.