In one or more arrangements, a cleaning system for cleaning a floor of a closed system is presented which has a cleaner configured to clean the floor of the closed system, and the cleaner enters the closed system at a position located below a surface level created by liquid within the closed system. In one or more arrangements, the cleaning system may contain a gate complex configured to allow selective access into the closed system. In one or more arrangements, the cleaning system may contain a box system and wherein the cleaner is initially positioned at least partially within the interior volume of the box system.