Alexander Semenov is a marine biologist, specializing in invertebrates. He’s the head of the divers’ team at Moscow State University’s White Sea Biological Station where he organizes and manages all sorts of work, often diving in harsh conditions. Semenov is also a professional photographer. During one of his dives under the ice in the White Sea in Russia, Semenov recorded a creature known as the sea angel. The high-quality footage reveals the tiny sea slug’s beauty as well as Semenov’s masterful control of the camera.