Russian Marine Biologist and underwater photographer Alexander Semenov is back with some new Astonishing Creatures from the Depths of the World’s Oceans. Alexander is currently leading a team of scientists on a three-year-long Aquatilis expedition to explore the deep waters around the world.

If you’re like me, the only possible reaction to these recent photographs by marine biologist Alexander Semenov is “What is that? What is that?! WHAT IS THAT!?” Semenov is the head of the diving at Moscow State University’s White Sea Biological Station where he brings nearly a decade of underwater photography experience to a wide variety of research and exploration projects. He focuses mostly on invertebrate animals found in the Arctic ocean: squishy, wiggly, translucent creatures from jellyfish to worms found deep underwater, most of which have never been documented with such detail and clarity.

Semenov shares about his work in an artist statement:

” My key specialism is scientific macro photography in natural environments. This practice makes it possible to observe animals that cannot be properly studied under laboratory conditions, such as soft bodied planktonic organisms or stationary life forms living on the seafloor. My personal goal is to study underwater life through camera lenses and to boost people’s interest in marine biology. I do this by sharing all my finding through social media and in real life through public lectures, movies, exhibitions and media events. “

Seen here are a collection of images from the last year including expeditions to the Southern Kuril Islands, the Southern Maldives, the White Sea, and the Mediterranean, but there’s hundreds of additional photos on Flickr.