Florida · about 25 km from Live Oak
The Cracks (Crack Sink & Crack Spring)
Info · exploration
Information only: according to Karst Underwater Research (KUR) the cave is not open to the public.
- Max depth53 m (174 ft)
- CertificationFull cave
- SpecialSidemount
Diving and fills
Dive here with
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Fills nearby
- Amigos Dive Center (Fort White)Air to 4,500 psi (~310 bar), nitrox 21–40 %, medical O₂ (also for rebreathers), custom trimix (continuous blender), argon
- Ginnie Springs dive shopAir (high-volume) and nitrox 32 %; no trimix listed. Prices 2026, excluding tax: air $9, doubles air $14, nitrox single cylinder $15, nitrox $0.15 per cubic foot (for top-offs and doubles)
- Extreme Exposure (High Springs)Air, nitrox (32 %, 50 %), O₂ (AL40) and trimix ('mix' in doubles); walk-in fills of your own tanks: ask
Now at The Cracks (Crack Sink & Crack Spring)
The dive
From a small, clear sink in a limestone wall you crawl to the Crack Pit, a sloping fissure that drops from ~9 to ~44 m.
Profile and sections
From a small, clear sink in a limestone wall you crawl to the Crack Pit, a sloping fissure that drops from ~9 to ~44 m. Beyond it fissure-like passages run at 43 to 46 m, with low, silty bedding planes, side passages that loop back and the cooler, clear Cold Tunnel. Visibility is normally about 12 m, but at the entrance and after digging sometimes only 1 to 2 m.
Guy Bryant and Court Smith found the spring and the sink, first called Power Line Springs, on a canoe trip; in 1982 they pulled a boulder from the entrance and explored the cave. Bryant mapped ~415 m in the 1980s. Since late 2021 KUR has been re-lining, exploring past the old end and has surveyed to ~720 m from the sink. Spring and sink are almost certainly connected, but the restrictions have so far prevented a traverse.
Practical: information only.
- Depth and profile
- Plan for ~-53 m: at a fissure just past the entrance the cave drops in one go from ~-9 to ~-46 m, then ~-43 to -46 m and further to at least -53 m · surveyed to ~720 m from the sink
- Configuration
- Restrictions at both entrances; formerly backmount, but the Cold Tunnel restriction and the Perpendicular Tunnel need sidemount.
- DPV: Not DPV-suitable (estimate)
- Not open to the public; tight fissure passages.
Who can dive where
- At least Full cave
- Configurations: Backmount / twinset / Sidemount / CCR
- Goes down to 53 m (trimix or deco may be needed)
- Experienced divers only
This is how the planner decides who in your team may dive this cave. Rules your own trip adds (organizer, a mail, the AI) show with your trip.
How to get there
On the Withlacoochee in Twin Rivers State Forest, beneath a power line between Madison Blue Spring and the Suwannee. Crack Spring lies in a rock face in the river, Crack Sink ~15 m up an intermittent spring run.
Around The Cracks (Crack Sink & Crack Spring)
Fills3 fill stations · nearest 72 km
Amigos Dive Center (Fort White)
5472 SW Elim Church Rd, Fort White, FL 32038
Air to 4,500 psi (~310 bar), nitrox 21–40 %, medical O₂ (also for rebreathers), custom trimix (continuous blender), argon
During shop hours (times not listed) — ask
Walk-ins welcome. O₂-clean equipment required for O₂. Dive centre in 'cave country' since 2006.
Ginnie Springs dive shop
Ginnie Springs Outdoors (in the park), near High Springs, FL
Air (high-volume) and nitrox 32 %; no trimix listed. Prices 2026, excluding tax: air $9, doubles air $14, nitrox single cylinder $15, nitrox $0.15 per cubic foot (for top-offs and doubles)
Park hours: Mon–Thu 8:00–17:00, Fri–Sat 8:00–19:00, Sun 8:00–18:00. Last fill between 15:00 and 17:00, depending on the fill technician's availability
Rents cylinders (incl. nitrox steel 85), BCs, regulators, suits and lights. Personal compressors are banned in the park.
Extreme Exposure (High Springs)
18481 High Springs Main Street, High Springs, FL 32643
Air, nitrox (32 %, 50 %), O₂ (AL40) and trimix ('mix' in doubles); walk-in fills of your own tanks: ask
Daily 8:00–18:00
Tech and cave shop since 1995. Rents singles, stages and doubles (steel/alu, air, nitrox or mix), regulators, backplate/wing, lights and scooters; training.
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