A team of scuba divers from Russia explores under the ice to find sea angels in the chilly White Sea.

Green slime — an invasive Spirogyra algae — is taking over Siberia’s Lake Baikal, the world’s largest freshwater lake.

Follow in the footsteps of Nat Geo photographer Viktor Lyagushkin and dive Russia's Baltic Sea. But before you go, here's what you need to know.

The amazing story and photos from the underwater exploration of Imperial Russia’s frigate Oleg shipwreck by National Geographic photographer Viktor Lyagushkin.