| 21. | Most blue holes contain freshwater and saltwater.
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| 22. | That was unusual, because when it gets dark the Blue Hole can be downright scary.
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| 23. | To the Blue Hole they went.
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| 24. | The Blue Hole is a submarine sinkhole, around 94 m ( 300 feet ) deep.
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| 25. | The site is signposted by a sign that says " Blue hole : Easy entry ".
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| 26. | The Blue Hole that once was a tourist attraction is now off limits to the public.
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| 27. | That's the Great Blue Hole in Belize, to the best of my knowledge.
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| 28. | In addition to these coral reefs, it is also home to the Great Blue Hole.
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| 29. | Dean's Blue Hole is roughly circular at the surface, with a diameter ranging from.
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| 30. | There are several fresh water sinkholes on land that are deeper than Dean's Blue Hole.
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