The Aquarion is located on Building Block B of Namimori Middle School that has been remodeled. Spectators can watch the battle outside. Pillars of water continuously rain down on the battlefield, coming from the top floor which acts like a water tank.
The windows and doors of the building are sealed, thus the battlefield will eventually be flooded. When the water rises to a predetermined level, a ferocious sea beast would be released, which was later revealed to be a shark.
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