Whether this is the first time you've ever heard of the Underwater Photographer of the Year competition or not, it presents a lot to get excited about. And according to Dr. Alexander Mustard, the contest's chairman, this is its biggest year ever with 5,000 photos coming in from 65 different countries.
Before it took on its current, international form, the competition has been celebrating excellence in British underwater photography since 1965.
Why British photographers, specifically? That's because William Thompson took the first underwater photo in England back in 1856 and the nation's been at the forefront of innovating and perfecting the art ever since.
And now, we've got a breathtaking sense of how much richer all of that progress has left the world.