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Florida · about 8 km from Marianna

Hole in the Wall (Merritt's Mill Pond)

  • Max depth24 m (79 ft)
  • CertificationCavern
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Diving and fills

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Fills nearby

  • Fill stationCave Adventurers (Marianna)~6 min drive (estimate)Air, nitrox 32 % (banked), trimix (advance notice), O₂, helium, argonRoute ↗
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The dive

A muddy cavern with upstream and downstream passages, both worth diving. There is low to no flow; in the colder months the cave usually siphons (water flows in).

Profile and sections

A muddy cavern with upstream and downstream passages, both worth diving. There is low to no flow; in the colder months the cave usually siphons (water flows in). It is home to the blind cave salamander.

Practical: the best season is April–October; the pond water cools outside that period (Chipola Divers).

Depth and profile
Entrance at ~-2.5 m · large chimney down to ~-24 m · downstream ~210 m to the 'big E'
Configuration
All configurations.
DPV: DPV possible (estimate)
Little flow; a scooter can be used in the roomier passages, but the gain is unknown.
Who can dive where
  • CaveAt least Cavern
  • Whole caveConfigurations: Backmount / twinset / Sidemount / CCR / Small cylinders / no-mount (speleo sumps)
  • Whole caveGoes down to 24 m (trimix or deco may be needed) · doesn't decide who may dive

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: ~275 m from the Cave Adventurers dock (pontoon rental) or from the free boat ramp on Hunter Fish Camp Road.

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Around Hole in the Wall (Merritt's Mill Pond)

Fills1 fill station · 1 km

  • Cave Adventurers (Marianna)

    ~6 min drive (estimate)

    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.

    Website ↗Navigate ↗
Where to sleepAround Marianna on Booking.com ↗

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Caves nearby4 within 51 km

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.

More of the latest in Florida (USA): conditions, closures and news →

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Sources, sharing and disclaimer

Sources

Current conditions

Visibility, flow and water levels change quickly. Right before your dive, check what other divers report:

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Certification requirements, configurations and trimix depths are estimates for planning. Always check them locally and dive within your training. Compiled from web research (Florida State Parks, FWC, Suwannee and Walton County, Ginnie Springs, dive centres in High Springs, Fort White, Luraville and Marianna, NSS-CDS, USGS, wannadive.net, Divernet, Wet Rocks Diving, news; Sept 2026). Pins mostly from the USGS spring records (NWIS), compared with Wikipedia and wannadive; Orange Grove Sink from Grottocenter; ~ = estimate. Paradise Springs, Hart Springs, Bonnet Spring and Weeki Wachee were added in Oct 2026 (DivingFL, Hart Springs Park, Visit Gilchrist County, Extreme Exposure, Bay News 9, Wikipedia); Ginnie Springs Outdoors, dive manager (message, Oct 2026). Cherokee Sink was added in Nov 2026 (Visit Wakulla, Visit Tallahassee, America's State Parks, GUE/WKPP, dive reports on ScubaBoard; pin from OpenStreetMap). Rules, prices and access change — check locally.