Is Blue Grotto naturally blue?

This hole filters sunlight from outside of the cave and combines with the entrance light to illuminate the sea waters which gives it its glowing effect. The waters natural colour is already a pristine sapphire colour which contrasts against the caves dark, rugged walls and adds to the grottos radiance.



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The Blue Grotto Capri, or Grotta Azzurra, is a natural wonder that leaves visitors in awe. This mesmerizing sea cave on the island of Capri, Italy, is known for its breathtaking azure waters and enchanting atmosphere.

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Visitors are not allowed to swim into the grotto or dive from rowboats to swim inside the cavern. Many visitors wait until after 5:30 p.m. when the rowboats leave and the ticket office closes to swim inside. This is illegal and dangerous, as the high waves can slam swimmers against the stone of the low cave mouth.

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The island of Capri is riddled with caves and grottos, and the Blue Grotto was not a mystery to locals. Known locally as Gradola, it had been avoided as it was said to be inhabited by monsters or evil spirits. The Blue Grotto is 60 meters long by 25 meters wide. The clear blue waters below the boat are 150 meters deep.

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The Blue Grotto lets you dive down to a depth of 100 feet (30 meters) in crystal clear water all the way down at a water temperature of 72 degrees Fahrenheit (23 degrees Celsius) all year round.

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Not to be confused with the Blue Lagoon, which is located in the North West of the archipelago, in the island of Comino, the Blue Grotto is a complex of seven caves found along the southern coast of the island, right across from the little islet of Filfla, and less than a kilometre west of Wied iz-Zurrieq.

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Plants and animals are visible through the water in the caverns, and divers can see barracudas, jacks, octopus, and morays in the water itself. The caverns also offer a view of Fiflia, an inlet uninhabited by humans, which is home to endemic species, such as the Maltese wall lizard.

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Why is the Blue Grotto so, um, blue? The bright azure color of the water inside the cave is due to the sunlight which enters the cavern through an underwater opening which is positioned exactly under the cave's mouth.

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Many people think of the open sea as the domain of sharks, but perhaps surprisingly, several species of sharks prefer to inhabit caves and even small crevices in reefs. Certainly those species known as nurse sharks routinely wedge themselves under ledges when resting.

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The Massabielle Grotto is the very place where the apparitions occurred, and within it is the spring that Bernadette discovered. To the right of the Grotto are the Taps where you can drink Lourdes water. Those who wish to can also go to the Sanctuary Baths and perform the water gesture.

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