Alec's Caverns
Descend into an oceanic blue hole where natural light windows illuminate rare cryptic sponges and schools of glassy sweepers swirl in cathedral-like chambers.
Alec's Caverns stands apart from Andros's inland blue holes as an oceanic formation, a vertical cavern system that opens directly into the seafloor near the barrier reef. Divers slip into the deep blue maw and descend to approximately 130 feet, where looking back toward the surface reveals one of diving's most dramatic perspectives: natural light windows creating ethereal illumination against the silhouette of the reef above.
The cavern walls host rare cryptic sponges and other organisms typically found only in these unique environments where reduced light and specific water chemistry create specialized habitats. Schools of glassy sweepers swirl in the chambers, their silvery bodies catching what little light penetrates, while the occasional nurse shark rests in deeper recesses.
The Descent
Entering Alec's Caverns begins at a fissure in the seafloor where the coral reef gives way to the vertical blue hole opening. Divers descend along the walls, which transition from reef environment to the smooth limestone characteristic of blue hole interiors. The diameter widens as depth increases, creating a sense of entering a subterranean cathedral.
At approximately 130 feet, divers find the most dramatic vantage point. Looking upward, cracks and natural windows in the reef above create patterns of light that shift with wave action and sun angle. The face in the rock, a natural formation resembling a human profile, has become a landmark for guides directing divers to the optimal viewing position.
Unique Marine Life
The low-light environment of Alec's Caverns supports species rarely encountered on open reefs. Cryptic sponges, specialized to thrive with minimal photosynthesis, cover portions of the walls in muted colors that glow when illuminated by dive lights. These organisms represent a window into ecosystems that existed before the evolution of surface reefs.
Schools of glassy sweepers are the cavern's signature residents, their translucent bodies and large eyes adapted to the dim conditions. Squirrelfish, another low-light specialist, occupy recesses in the walls. Nurse sharks occasionally rest on ledges within the cavern, seemingly undisturbed by visiting divers.
Diving Requirements
The 130-foot depth and overhead environment make Alec's Caverns appropriate for experienced divers with Advanced Open Water certification or equivalent. While the cavern remains open to the surface with visible ambient light, the depth limits bottom time and requires confident air management. Dive lights are essential for appreciating the cryptic sponges and other light-sensitive organisms.
Small Hope Bay Lodge guides are intimately familiar with the cavern layout and lead divers to the most rewarding viewpoints. The site is typically reserved for experienced dive groups due to its depth and technical nature.
Getting there
Alec's Caverns is accessed by dive boat from Small Hope Bay Lodge or other Central Andros dive operations. The oceanic blue hole lies near the barrier reef, approximately 10 to 15 minutes from Fresh Creek by boat. Divers fly into Andros Town Airport via connecting flights from Nassau. Due to the site's depth and technical nature, advance booking with experienced dive operators is recommended.
Frequently asked questions
- What is the face in the rock?
- The face in the rock is a natural limestone formation within Alec's Caverns that resembles a human profile when viewed from the correct angle with light behind it. It has become a landmark that guides use to position divers for the best views of the natural light windows.
- How is this different from inland blue holes?
- Alec's Caverns is an oceanic blue hole, meaning it opens into the seafloor rather than forming an inland pool. The water is fully marine rather than the freshwater-over-saltwater stratification found in inland holes, and the marine life reflects this oceanic environment.
- What certification do I need?
- Advanced Open Water certification or equivalent is required due to the 130-foot depth. Demonstrated experience with deeper dives and comfort in overhead environments is expected. Some operators may require documented deep diving experience beyond basic certification.
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