15 Impressive Underwater Caves That Will Mesmerize You

The Grotto, Bruce Peninsula National Park, Canada

A large sea cave with an underwater tunnel that runs from the pool, through the cliff to Canada’s Georgian Bay, The Grotto is known for the brilliant blue color of its waters. Divers have two options to enter the cave – either via a rocky tunnel from the top, or climb 40 feet (12 meters) down the cliff.

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