Blue Grotto Introduction: The Blue Grotto (The Grotto) is located in the northeast corner of Saipan. It is a natural cave connected to the Pacific Ocean. It was rated as the second largest cave diving site in the world by "Diver" magazine. The blue hole looks like a dolphin with its mouth open, and the inside is a natural cave formed by seawater erosion. There are two natural swimming pools inside, connected to the outside ocean through submarine channels. For experienced deep-sea divers, this will be an unparalleled diving experience.
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