Бассейн “Луч“ is an indoor training pool in Moscow with six lanes and a variable-depth layout built for closed-water scuba work. It is used for buoyancy checks, equipment testing, and introductory pool sessions, so the environment is controlled and predictable rather than natural or current-driven. Divers use it as a dependable practice venue when they want a repeatable place to rehearse skills before open water, with facility rules and session scheduling doing most of the planning work.