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Grand Bahama Island, The Bahamas; a view of the main cavern in Ben's Cave, looking back towards the water's surface and diver's entry point, the main cavern is approximately 200 feet long, 100 feet wide and 50 feet deep, there is freshwater in the first 25-30 feet and saltwater below, the freshwater makes the limestone white, while the saltwater below the halocline turns it dark