Fetch! Amazing Underwater Dog Photography from animal portrait photographer Seth Casteel.
Sarosh Jacob filmed this at Jellyfish Lake on Eli Malk island in the Republic of Palau. Twelve thousand years ago these jellyfish became trapped in a natural basin on the island when the ocean receded. With no predators amongst them for thousands of years, they evolved into a new species that lost most of their stinging ability as they no longer had to protect themselves. They are pretty much harmless to humans although some people with very sensitive skin may get a minor irritation from them.
Indonesian Hengki Koentjoro has become a master of Underwater Black and White Photography as these images show.
Chromatics, an amazing collection of underwater photography from Bloodyloud favourite Barbara Cole who has an incredible talent of making her photos look like impressionist paintings.
Weird and beautiful planktonic lifeforms from the Red sea by photographer Alexander Semenov from Russia.