The Blue Hole reaches down 30 metres and its contents can only be seen by diving below the surface. | National Geographic UK

Flying into the deep darkness of The Blue Hole in Belize... Credit: Dive Easy | UNREEL

Dive into the Great Blue Hole💙, Belize's majestic underwater wonder! 🌊✨ At a staggering 407 feet deep, this natural marvel offers an unforgettable adventure. Explore its deep blue depths, swim among stunning stalactites, and marvel at the vibrant marine life. It's not just a dive; it's a journey into the heart of the ocean's mysteries! 🐠🌟 #TravelBelize #Belize #TheGreatBlueHole 📹: @kaysadventure | Travel Belize

The Great Blue Hole is a giant marine sinkhole off the coast of Belize. 🇧🇿 It lies near the center of Lighthouse Reef, a small atoll 70 km (43 mi) from the mainland and Belize City, the hole is circular in shape, 318 m (1,043 ft) across and 124 m (407 ft) deep. It was formed during several episodes of quaternary glaciation when sea levels were much lower. Analysis of stalactites found in the Great Blue Hole shows that formation took place 153,000; 66,000; 60,000; and 15,000 years ago. As the o