Underwater Photography Guide, a popular online resource for underwater photographers, is accepting entries for the 2013 Ocean Art Underwater Photo Competition. The competition is open to underwater photographers of all experiences levels and includes 12 categories:

Cold/Temperate Water
Compact Camera (three categories)
Marine Life Behavior 
Marine Life Portraits
Novice DSLR
Super Macro
Entries must be submitted online no later than November 10, 2013.
Prizes valued at more than $75,000 will be awarded, including more than 35 live-aboard and resort scuba diving vacation packages, scuba diving equipment, and more.
Judges include underwater photography experts Martin Edge, California Diving News Senior Editor Marty Snyderman, Tony Wu and Todd Winner.
There is no restriction on the date or location of photo entries. For complete underwater photo competition details and photo submission instructions, including entry fees, rules and restrictions and details on prizes to be awarded, visit Underwater Photography Guide’s website, www.uwphotographyguide.com