Watch this amazing video of Guillaume Nery holding his breath and base jumping (underwater) into Dean's Blue Hole which is over 663 feet deep... the video was filmed by his girlfriend Julie Gautier.
-Check it out below:
Located in the Bahamas this is the world's deepest known sink hole filled with water...
Dean's Blue Hole is roughly circular at the surface, with a diameter ranging from 25 to 35 meters (82-115 ft). After descending 20 meters (66 ft), the hole widens considerably into a cavern with a diameter of 100 meters (330 ft).
Guillaume Nery base jumping at Dean's Blue Hole, filmed on breath hold by Julie Gautier from Umblu Liber on Vimeo.