Florida
Diepolder II & III (Sand Hill Scout Reservation)
Closed to divers
Closed: the Boy Scouts, who own the land, ended the guide programme around 2016 over liability concerns and nobody has dived there since; in 2026 a rezoning request for part of the camp is pending.
- Max depth111 m (364 ft)
- CertificationFull cave
- SpecialExperienced divers
Diving and fills
Dive here with
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Fills nearby
- Extreme Exposure (High Springs)Air, nitrox (32 %, 50 %), O₂ (AL40) and trimix ('mix' in doubles); walk-in fills of your own tanks: ask
- Cave Country Dive Shop (High Springs)Air, nitrox 32 % and 50 %, O₂, helium; trimix 21/35, 18/45, 10/70 and custom; CCR O₂ fills
- 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)
Now at Diepolder II & III (Sand Hill Scout Reservation)
The dive
Two sinks on the scout camp near Brooksville, left by the Diepolder family.
Profile and sections
Two sinks on the scout camp near Brooksville, left by the Diepolder family. They were explored for thirty years under Florida's strictest guide system (Florida Speleological Researchers: full cave plus 100 cave dives, trimix, one guide per two or three guests, and Sink III first before Sink II was allowed).
Practical: they are on the site because the name comes up everywhere, but there is no access now, and the land's future is uncertain.
- Depth and profile
- Diepolder III about -91 m (300 ft), Diepolder II about -111 m (365 ft): the deepest cave in the aquifer and in the continental US
- Configuration
- When it was still open: backmount or sidemount, rebreathers only in Sink III.
- Gas
- Trimix from 45 m (148 ft)
Who can dive where
- At least Full cave
- Configurations: Backmount / twinset / Sidemount / CCR
- Goes down to 111 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
Around Diepolder II & III (Sand Hill Scout Reservation)
Fills3 fill stations · nearest 0 km
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.
Cave Country Dive Shop (High Springs)
19808 N US Hwy 441, High Springs, FL 32643
Air, nitrox 32 % and 50 %, O₂, helium; trimix 21/35, 18/45, 10/70 and custom; CCR O₂ fills
Daily 7:00–19:00
Prices per cu ft online (e.g. 18/45 $2.04, 10/70 $3.15, O₂ $0.50; CCR O₂ min. $6). Rentals: backmount/sidemount doubles $14/day, trimix bailout cylinder $16, SUEX scooter $85/day, Shearwater computers. Cave courses from cavern to full cave and CCR cave (TDI, IANTD, NSS-CDS) by the owner's BJL Diving, and guided cave and spring dives, also with scooter, CCR, trimix and stages.
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.
Drive times from High Springs: we don't know this site's exact spot.
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