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Ireland and Northern Ireland · about 6 km from Blacklion

Shannon Cave (Fermanagh – Cavan)

Info · exploration

Information only: this cave was explored by cave-diving expeditions, and we know no dive centre, guide or club that takes visitors.

Source: Speleological Union of Ireland – Access ↗
  • CertificationFull cave
  • SpecialSidemount
Directions

Diving and fills

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Now at Shannon Cave (Fermanagh – Cavan)

Status
Closed

The dive

The cave feeds the Shannon Pot. In 2008 British divers passed a 40 m sump ("Young, Free and Desperate") and bypassed sump 4; sump 5 ("Long Way From Home") is the new end.

George's Choke and other boulder chokes are unstable and moved further after July 2025; a rescue beyond George's Choke may not be possible.
Source: Speleological Union of Ireland – Access ↗
Profile and sections

The cave feeds the Shannon Pot. In 2008 British divers passed a 40 m sump ("Young, Free and Desperate") and bypassed sump 4; sump 5 ("Long Way From Home") is the new end.

Source: Wikipedia – Shannon Cave ↗Source: Speleological Union of Ireland – Access ↗
Depth and profile
Cave of 5.4 km and 130 m deep · sump 3 (terminal), a 40 m sump (2008) and sump 5 as the new end
Configuration
Expedition dive far beyond unstable boulder chokes: light sidemount.
Who can dive where
  • CaveAt least Full cave
  • Whole caveConfigurations: Sidemount / Small cylinders / no-mount (speleo sumps)
  • Whole caveExperienced divers only · doesn't decide who may dive
Dry sections / haulingExperienced diversDepends on water level or swell

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.

Source: Wikipedia – Shannon Cave ↗Source: Speleological Union of Ireland – Access ↗

How to get there

The Polltullyard entrance is in Fermanagh; most of the cave runs under Cavan. With an experienced guide only; the landowner asks cavers to avoid the cave in April (lambing).

Plan your route ↗

Around Shannon Cave (Fermanagh – Cavan)

FillsNo fill station known nearby
Other sites3 within 16 km

No provider in Ireland yet

The caves here are listed as information only: we don't know a dive centre, guide or club yet that takes visitors, so you can't plan a trip here yet. Do you know one, or are you one? Let us know.

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Sources, sharing and disclaimer

Sources

Source: Wikipedia – Shannon Cave ↗Source: Speleological Union of Ireland – Access ↗

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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 (Oct 2026): Wikipedia, Darkness Below (Pollatoomary 2025), InDEPTH, UBSS Proceedings (1986), the Northern Pennine Club (1987), ukcaves.co.uk, the Burren Geopark, Grottocenter, the Speleological Union of Ireland (access), NIEA's Earth Science Conservation Review, cavesofireland.com, the Cuilcagh Lakelands Geopark, Saolta (University Hospital Galway), thejournal.ie, BSAC and the British Hyperbaric Association. Every cave is listed as information: we know no provider that takes visitors. Pins from OpenStreetMap, Wikipedia and the ESCR. ~ = estimate, ask = not confirmed.