Porth yr Ogof
Cave and mine diving in South Wales and Mendip · about 7 km from Glynneath
- Max depth
- 7 m
- Type
- Sidemount
- Certification (estimate)
- Intro to cave
- DPV
- Not DPV-suitable
2.25 km cave where the Afon Mellte goes underground and resurges at the Resurgence Pool; heavily used by dry cavers (over 30,000 visitors a year) and as a training cave.
More about Porth yr Ogof
Signed-in divers also see:
- Whether this site fits everyone's certification, gas and gear
- Access, parking and the route from the road
- Exact map pin and navigation
- Depth profile and sumps
- Configuration advice
- Warnings with sources (4)
- DPV suitability
- Driving times from your stay and a plan with the AI instructor
News
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Current conditions
Visibility, flow and water levels change quickly. Right before your dive, check what other divers report:
- Cave Diving Group (CDG) ↗
The British cave-diving club (Somerset and Welsh sections): access, conditions and temporary membership for overseas cave divers.
- Cave Diving Group (Facebook) ↗
The CDG's page with news.
- UK Mine/Cave Diving and Exploration (UKMC) ↗
Club for mine and cave divers (Intro Cave/Mine minimum), with BCA insurance via the club and a private members' Facebook group on conditions and trips.
- UK Caving forum ↗
British caving forum with Wales, Mendip and Forest of Dean sections; diving topics too.
- FoDCCAG – Caves & access ↗
Forest of Dean access group: permits for BCA members.
Plan a cave diving trip to South Wales and Mendip
Enter your team, with certifications, gas and configurations, and see right away which caves fit. With driving times from your stay, fill stations and an AI instructor who thinks along.
Certification requirements, configurations and trimix depths are estimates for planning. Always check them locally and dive within your training. Compiled from public sources (Cave Diving Group, InDEPTH 2020–2021, TDI/Scubaverse 2019–2021, UKMC, ogof.org.uk, Brecon Beacons National Park Authority 2009, Wikipedia, aditnow, Coflein, Natural Amenities Ltd, cave-dive-make, FoDCCAG, mindat, Martyn Farr/Vertebrate 2024, British Caving Association, British Hyperbaric Association, DDRC, NDAC, divernet, Vobster Quay and Cardiff Scuba; Sept 2026). Pins converted from grid references (ogof.org.uk, aditnow, mindat) or taken from Wikipedia; the Noxon Park pin is accurate to ~100 m. ~ = estimate. Access and rules change — check locally.