Full access information for Ogof Ffynnon Ddu is available from the OFDCMC website
Through Trips: There are several places where route-finding is hard, and in 2012 there were a number of rescue call-outs to parties who had got lost trying to make the connection. You are advised to become familiar with the cave from both directions before attempting a through trip and at least have a detailed map with you.
Access to Ogof Ffynnon Ddu I, II & Cwm Dwr
The entrances to OFD I, II & Cwm Dwr are located in owned by either National Resources Wales or SWCC, access is administered jointly under a single access arrangement by means of a permit. Unless you are a member of a club
with an annual permit, you will need to arrange this in advance
by contacting the Ogof Ffynnon Ddu Management Committee Permit
Please note that:
Ogof Ffynnon Ddu I - Approach Routes
If you are walking from the SWCC HQ: Take the road down the hill, past
the houses, and take the footpath signposted on your right (through a gate).
There is a bathtub a few metres down. Follow the path for another 500m or
so, through a wooden gate, and you will come to the site of a previous gate.
Turn left and walk beside the dry stone walling and then cross the wire
fence at the point where there is no barbed wire. This brings you out just
above the cave entrance; take care as the path down the bank is often slippery.