The full depth of the Blue Hole is approximately 410 feet deep. The underwater ecosystem continues to completely change as the crew moves towards the bottom. | Discovery

1.8M views · 3.1K reactions | Off the coast of Belize lies a massive underwater sinkhole. Welcome to the Great Blue Hole. | Brut nature | Facebook

Before we fully commit to a well we run a test hole bit to see things like: Depth to water Flow potential Formation type Etc. Great crew making this happen! #welldrilling | Blue Sage Services, LLC

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