Divers can swim along the walls 124 meters to the ground and explore the stalagmites. But beware! Apart from needing a lot of diving experience, it is also very dark down there.
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Blue holes, physically, are hazardous due to their structure and depth. Their surrounding walls cause bad water circulation, meaning the water is generally depleted of oxygen.
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.
Is It Safe to Swim in The Ocean in Belize? Yes, it is relatively safe to swim in the ocean in Belize. When you visit Belize's most popular beaches — Placencia, Maya Beach, Ambergris Caye, and Caye Caulker — you'll find clear, shallow water that makes for easy swimming and snorkeling.
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.
April to June offers the best visibility, November to April is the dry season, which also means it's high tourist season, and June to October is the rainy season.