How deep is Blue Grotto?

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. The dive begins at the mouth of the cavern, which is 80ft wide and 20ft high.



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Sunlight passing through an underwater cavity and shining through the seawater creates a blue reflection that illuminates the cavern. The cave extends some 50 metres into the cliff at the surface, and is about 150 metres (490 ft) deep, with a sandy bottom.

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The Blue Grotto is 60 meters long by 25 meters wide. The clear blue waters below the boat are 150 meters deep. The unearthly blue light effect is caused by the refraction of daylight through the above water cave opening and a larger submerged opening.

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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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This dive site itself is split into two areas; the Cavern and the Cave. 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 water is a constant 72 degrees year round. There are showers and changing areas. Devils Den is an underground spring inside a dry cave in Williston, Florida.

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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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Entrance to the Blue Grotto is possible only by boarding small rowboats which hold a maximum of four passengers at a time. The entrance ticket must be purchased at the floating ticket office at the cave entrance.

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The Blue Grotto is a natural sea cave, 60 meters long and 25 meters wide. The cave mouth is two meters wide but only roughly a meter high, so to enter visitors must board small rowboats which transport a maximum of four passengers.

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(The absolute deepest known cave on Earth is the Veryovkina Cave in Georgia, at more than 6,800 feet deep.) The Hranice Abyss is located in a limestone formation in the Czech Republic.

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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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