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The Marine Cathedral is a church that was under construction out in the bay in Tokyo. It appeared in the episodes Destiny's Arrival and The Purity Chalice.
This structure was picked by Eugeal as the location to meet Amara Tenoh and Michelle Kaioh to discuss the holders of the Pure Heart Crystals. Eugeal set booby-traps throughout the cathedral in hopes of wearing her enemies down before removing their Crystal Treasures.
In trying to escape the building, Eugeal plummeted to her death when the breaks to her car were corroded by acid snails.