Great Blue Hole
The Pit · Belize
Cousteau's famous circular sinkhole, 300 m across and 125 m deep, off Lighthouse Reef. The dive descends past 30 m where massive stalactites lean from the rim — relics of a dry cave that collapsed when sea levels rose. More geology trip than reef dive; the deep, dark profile is the draw.
Conditions
Depth
25 to 40 m
Advanced depths
Current
Usually gentle
Can pick up on the edge
Visibility
15 to 30 m
Clearest in the calm season
Water
25 to 29°C
Tropical wetsuit
Month by month
| Month | Jan | Feb | Mar | Apr | May | Jun | Jul | Aug | Sep | Oct | Nov | Dec |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Water (°C) | 25 | 25 | 26 | 26 | 27 | 28 | 28 | 28 | 28 | 27 | 26 | 25 |
| Vis (m) | 20 | 20 | 25 | 25 | 25 | 20 | 20 | 20 | 15 | 15 | 20 | 20 |
| Current | Gentle | Gentle | Gentle | Gentle | Gentle | Gentle | Gentle | Gentle | Gentle | Gentle | Gentle | Gentle |
Your chances of seeing each animal
Magnificent Frigatebird
Last confirmed Jun 3, 2026 · 40 records
Almost always
Nearly every dive
Caribbean reef shark
Last confirmed May 15, 2026 · 130 records
Almost always
Nearly every dive
Caribbean Land Hermit Crab
Last confirmed Apr 7, 2026 · 38 records
Very likely
Most dives
French Angelfish
Last confirmed Mar 17, 2026 · 12 records
Very likely
Most dives
Caribbean Reef Shark
Last confirmed Mar 17, 2026 · 18 records
Likely
About 6 in 10 dives
Stoplight Parrotfish
Last confirmed Mar 17, 2026 · 16 records
Likely
About 6 in 10 dives
Midnight parrotfish
Last confirmed Mar 17, 2026 · 10 records
Likely
About 6 in 10 dives
Bull shark
Expected
Known here, not yet in recent logs
Gear