Why is the Blue Grotto so 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. As the light passes through the water, the red reflections are filtered out and only the blue enter the cave itself.



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The Blue Grotto is one of several sea caves worldwide that is flooded with a brilliant blue or emerald light. The quality and nature of the color in each is determined by its unique combination of depth, breadth, water clarity, and light source.

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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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A: Swimming inside the Blue Grotto is not allowed during regular visiting hours. However, some visitors choose to swim into the cave after hours, though doing so can be dangerous and is not recommended.

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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 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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Blue grotto is thought to be Emperor Tiberius' personal swimming hole and temple. Geometry of the cave is also quite complex and mysterious. Three connecting passageways at the back of the main hall lead to the 'Room of Names', named after the graffiti visitors left over the centuries.

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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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Discovered in the time of Roman Emperor Tiberius, the Blue Grotto was initially thought to be haunted by evil spirits, being avoided by island inhabitants and visitors.

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Staying and Diving at the Blue Grotto Dive Resort The Cavern (seen in the picture below) is the most popular of the two. Here open water divers can enter the mouth of this massive sinkhole explore down to a depth of 30 meters (100 feet) in 23°C crystal clear water.

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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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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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The garden grotto went hand in hand with the idea of mountain caverns or underground caves. Grottoes, associated with cold, the desert, death, initiation- became, in the literary context, images of the interior of the Earth.

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More than just an empty rock face, the grotto has become one of the most famous natural attractions in Southern Italy for its enchanting bright blue waters. Only accessible by rowboat, the Blue Grotto is illuminated by the sunlight passing through an underwater cavity.

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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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