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Ireland and Northern Ireland · about 5 km from Blacklion

Marble Arch Caves – Skreen Hill (Fermanagh)

Info · exploration

Information only: the entrances are gated and only members of the Irish and British caving bodies get in; paid trips are not allowed and there is no diving offer.

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

Diving and fills

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Now at Marble Arch Caves – Skreen Hill (Fermanagh)

Status
Closed

The dive

A river cave of 11.5 km, with a show cave at the front. Beyond the Skreen Hill sumps divers found hundreds of metres of new passage in 1967; later dives in 2009 linked Prod's Pot via the Cascades to the system.

Fast-rising water: the caves flood in heavy rain.
Source: Wikipedia – Marble Arch Caves ↗
Profile and sections

A river cave of 11.5 km, with a show cave at the front. Beyond the Skreen Hill sumps divers found hundreds of metres of new passage in 1967; later dives in 2009 linked Prod's Pot via the Cascades to the system.

Practical: after the flood of 20 July 2025 a landslide closed the Cascades.

Source: Wikipedia – Marble Arch Caves ↗Source: NIEA ESCR – Marble Arch ↗Source: Speleological Union of Ireland – Access ↗
Depth and profile
System of 11.5 km and 94 m deep · short sumps between the Skreen Hill passages (25 m; ~30 m in 1967)
Configuration
Cave diving with dry sections in between: 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 swellPermission 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.

Source: Wikipedia – Marble Arch Caves ↗Source: NIEA ESCR – Marble Arch ↗Source: Speleological Union of Ireland – Access ↗

How to get there

In Fermanagh (Northern Ireland), in the Marlbank protected area (ASSI). SUI or BCA members only, after contacting the manager of the Marble Arch Cave Centre, an access agreement and proof of membership.

Plan your route ↗

Around Marble Arch Caves – Skreen Hill (Fermanagh)

FillsNo fill station known nearby
Other sites3 within 14 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 – Marble Arch Caves ↗Source: NIEA ESCR – Marble Arch ↗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.