The hall is dimly lit and painted a dark blue to resemble the deepest ocean habitats of its patron Pokémon. The temperature is also kept fairly low compared to other locations in the estate. The entire floor of the hallway is a long, continuous aquarium. If you look down through the glass, you'll see it contains many sea-based Pokémon such as Tentacool and Goldeen. A small feeding system is attached ,so if the residents wish to aid in the care of the Pokémon, it is easy to do so.
Note: Make sure to play close attention to the Physical Layout shown on the first post of the planning thread.