44K views · 1.2K reactions | Flying into the deep darkness of The Blue Hole in Belize... Credit: Dive Easy | UNREEL | Facebook

46K views · 929 reactions | Deep dive! | Red Bull Adventure | Facebook

C'est un gouffre sous-marin à couper le souffle, un trou noir de 35 mètres de large, une porte d'entrée dans les abysses. Le Dean's Blue Hole est l'une des plus grandes grottes verticales du monde. On vous y emmène. | TF1 INFO

This massive underwater hole in the Bahamas is believed to have been "dug by the devil." | AOL

191K views · 5.9K reactions | Practicing for Dean's Blue Hole - T-minus 1 week!!  Blue Freedom Apnea - Freediving Club #freediving | Amber Bourke Freediving | Facebook

5.4K views · 526 reactions | The surface was never the destination. .  by @andremusgrove in #deansbluehole For us to get this shot I had to do two dives on the same breath hold. Having fresh oxygen at my fingertips and then turning and swimming back down into the depths was counterintuitive to say the least  Wearing the @orcasportswear Zen wetsuit and @vertical_blue #blackfins . #freediving #surfaces #unfinishedbusiness | William Trubridge | Facebook

14K views · 93 reactions | Join us as we delve into the stunning world of world class freediving. At 663 feet deep Dean's Blue Hole in the Bahamas is the deepest saltwater blue hole on the planet and we are headed there for Vertical Blue 2016, a competition that draws some of the most extraordinary freedivers in the world. Hundreds of feet below the ocean surface with one breath, This is World of Adventure. | World of Adventure | Facebook