The full depth of the Blue Hole is approximately 410 feet deep. The underwater ecosystem continues to completely change as the crew moves towards the bottom. | Discovery
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🔹 Come see the bottomless* blue hole! 🌀 The Blue Hole is a spring aquifer on the property of Castalia Fish Hatchery. From the 1920s to 1990 the Blue Hole was a tourist site, attracting 165,000 visitors annually at the height of its popularity. Stop by to see this and more at the Castalia Fish Hatchery Open House coming up this Saturday. *The Blue Hole has been sounded and found to be about forty-three to forty-five feet (13.1 to 13.7 m) deep. | Ohio Division of Wildlife
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The Blue Hole reaches down 30 metres and its contents can only be seen by diving below the surface. | National Geographic UK
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