How Cosmonaut Candidates Train Underwater: Video from the Cosmonaut Training Center's Hydro Lab. Roscosmos cosmonaut candidates Anastasia Marmakova and Vladimir Vorozhko were trained at the Hydro Laboratory of the Cosmonaut Training Center. Underwater, they practiced standard Orlan spacesuit operations. The class was held with the support of divers and instructors from the training center.