Thank you for sharing. I have seen one other place like this in the USA . If i remember correctly it is in Chattanooga TN called Ruby Falls. I have travelled so much I often forget. This place I want to travel too one day for sure.
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Thanks for watching.
There is many submarine caves between Cassis and Ensues-la-Redonne (in south of France), including the famous Cosquer Cave
https://en.wikipedia.org/wiki/Cosquer_Cave