Florida · about 11 km from Marianna
Twin Caves (Merritt's Mill Pond)
- Max depth32 m (105 ft)
- CertificationCavern
- SpecialSidemount
Diving and fills
Dive here with
Fills nearby
- Fill stationCave Adventurers (Marianna)Air, nitrox 32 % (banked), trimix (advance notice), O₂, helium, argonRoute ↗
What it looks like
All 2 videos and posts
Videos and posts
From other divers, via YouTube, Instagram and Facebook. They only load when you click; after that, Google's or Meta's privacy rules apply.
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Other people's footage, not advice: how someone else dives here says nothing about what suits your team. Dive within your training.
The dive
There is low to no flow and it silts quickly (silty entrance). The cavern has two entrances. Indian Washtub (~140 m of passage after 2015 exploration, very silty) is nearby.
Profile and sections
There is low to no flow and it silts quickly (silty entrance). The cavern has two entrances. Indian Washtub (~140 m of passage after 2015 exploration, very silty) is nearby.
- Depth and profile
- Openings down to ~-18 m (Subway Tunnel, several hundred metres long) · three passages drop deeper · deepest point ~-32 m (105 ft); the Catacombs at ~-30 m
- Configuration
- Backmount works in the cavern and main part; the first jump is for sidemount with excellent buoyancy only.
- DPV: Not DPV-suitable (estimate)
- Silty with little flow; a scooter mainly costs you visibility.
Who can dive where
- At least Cavern
- Configurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
- Goes down to 32 m (trimix or deco may be needed)
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
Boat only: rent a pontoon at Cave Adventurers (dock on the pond) or use the free boat ramp on Hunter Fish Camp Road; the cave is mid-pond.
Around Twin Caves (Merritt's Mill Pond)
Fills1 fill station · 2 km
Cave Adventurers (Marianna)
5211 Limestone Ln, Marianna, FL 32446
Air, nitrox 32 % (banked), trimix (advance notice), O₂, helium, argon
Daily 8:00–18:00 (InDEPTH business directory)
Edd Sorenson's cave centre on Merritt's Mill Pond: CCR service and training up to CCR cave, guided dives, pontoon rental to Twin Caves and Hole in the Wall, scooter rental for Jackson Blue, lodging via Karst Kottages. Fills while you wait. The fill prices on the older website (air $5 single / $10 doubles, nitrox $0.11/cu ft) are probably outdated.
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News
All (1)
Nearby
Articles about cave diving that name a place within 25 km of this site, but no cave by name. They're not necessarily about this site.
Access and rules change: check what applies locally right before your trip. Source: GDELT Project and the news feeds of diving magazines. Search for more news ↗ Searched automatically, last on 13 Nov 2026.
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