Hi James,
I made a few trips down there last year pushing the terminal sump. As I was unfamiliar with the place, it took a few trips to find the downstream passage. It was a confusing place with many tight side passages which soon closed down. Much driftwood was wedged in ceiling cracks suggesting not a nice place to be in thunderstorms/wet weather. There was a sump which became a duck maybe 30m in from the entance. This will involve a wetting though the rest of the cave is dry. From here, the way on was not obvious, but after 10m, in a small ch, was a hole near the roof and not 1 of several passages leading downwards. This leads into a rift passage which whilst going through the tight lower section, I grabbed a very large boulder to haul on which started to fall, but then dubiously wedged. It's ideally shaped, and placed, to chop of ones legs if it does continue its downward journey, so be careful. I built a wall of rock to prevent people going under it, but if subsequent flooding has removed this, I don't know.
The big chamber provides a welcome interlude with good stall and a rescue dump. 2 ways of reaching the lower stream passage, 1 at the far side of the chamber, where a steep mud bank which is only possible on the right as you approch. This leads to Mud ch. Another, more confusing and potentially dangerous passage leads of near the entrance to the big chamber to also arrive in Mud ch. There are a few holes in the floor here which looked like they needed at least a rope which, being by my lonesome, I didn't go down. The lower stream pass was down over the boulders in the corner, into the only nice bit of passage in the cave, excepting the main ch. Alas, I couldn't make any progress underwater because sump 2 starting collapsing on me. Let me know when you are thinking of going cause I did find something which needs further investigation. It may be nothing but it may be the way into the Gower Master Cave!
Cheers, Mike Barnes