By Captain-tucker [CC BY-SA 3.0], from Wikimedia Commons
Crystal Cave is an underground cave in Bermuda, approximately 500 m long, and 62 m deep. The lower 19-20 m of the cave are below water level. Cave ceilings are adorned with rare chandelier clusters and delicate crystallized soda straws. An excursion to Crystal Cave also includes the neighboring Fantasy Cave, with Fantasy being deeper (88 steps down). The caves are known for their beauty, with many stalactites, stalagmites and deep, clear pools.
By Captain-tucker – Own work, CC BY-SA 3.0, Link
By Hoasjoe – Own work, CC BY-SA 3.0, Link
By Hoasjoe – Own work, CC BY-SA 3.0, Link
By Hoasjoe – Own work, CC BY-SA 3.0, Link
By Jon Sullivan [Public domain], via Wikimedia Commons
By Captain-tucker [CC BY-SA 3.0], from Wikimedia Commons
By Tomwsulcer [CC0], from Wikimedia Commons
By Tomwsulcer [CC0], from Wikimedia Commons
e MORFES 
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Misteri di grotte incontaminate, piene di fascino
Un saluto,silvia
Beautiful cave and fantastic photos 🙂
Love caves, especially those that are unadulterated by tourist activity, I like doing it with rope & head torch. Must admit that caves properly supervised are a good thing for those without the opportunity or ability (for that read, not mad!) to enjoy spectacular sights like you have shown.