It is a mudminer project.
The duck has been bypassed but not down the crawl you mention. That closes down after a few metres although it has a vocal connection to the large side. I'm not planning to open this and think it would detract from the exchange trip if this bypass was opened.
If you were to go up the hole above you at the start of the crawl then you climb up about 5m into another horizontal passage. Approx 80m further will bring you into large pot in the eldon extensions area. Exploration is ongoing and there are one or two loose areas, although the main route through (obvious) is stable. It is a dry way round but no easier and finding it from the large side is not obvious.
James