Why is Blue Hole so cold?

In 1932, it served as a fish hatchery; however, since the 1970s it has become a recreation site named Blue Hole Dive and Conference Center. The water in the hole completely renews itself in six hours—that's why the water is so cold and fresh. The flow speed is 11 m³ per minute (3,000 gallons per minute).



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Description. The Blue Hole is a clear blue body of water with a constant 62 °F (17 °C) temperature and constant inflow of 3,000 US gallons per minute (11 m3/min; 2,500 imp gal/min), enough to cycle out the water every six hours.

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The main big swimming hole when you first enter the park is absolutely deep enough to swim in. Divers have reportedly measured some spots as deep as 20 feet. But it's so freezing cold, between 50-60 degrees in the midst of summer, that you won't want to stay shoulder-deep for long.

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Small fee of $10 gives you access to the Blue Hole and the adjacent lake to swim in.

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Definitely a bucket list trip! Hubby and I went at the end of July 2018 as part of a day trip from Turneffe atoll to the Blue Hole, Half Moon Caye, and aquarium. We enjoyed the snorkeling experience and saw neat coral and fish.

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The Diving Skills Needed for the Blue Hole You will need at least an Open Water or Advanced Open Water diving certification for this dive. Divers must be very comfortable in their gear, have excellent buoyancy control and be able to equalize easily. Good physical health is also required.

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