Hi Richie, nice to hear someone missing me:)
I was there, that's true. Was trying to find entrance place (sink) and resurgence too.
Denis told me that earlier water was swimming by the first, old entrance but after some time (possibly about this blockage Denis told about) water started to swam into the second one, on the right hand side. When I was there cliff was looking a bit different than now after excavator work Richie:)
When I was trying to find the main sink I jumped there and fell, made wet my boots, trousers etc. but couldn't see much.
Water is murky there. I went to the other side of the main road and found I believe same spring but it was coming from small concrete whole under the road, looks like small bridge. On the other side was pit where was possible that water was coming from there. However it was badly overgrown by weeds and access in drysuit was risky. If I could have some other clothes I would try.
Place is worth to visit as we don't know much about it but I don't expect any huge passage there, after reconnaissance I've done. I think side mount is good choice there.
Good luck Artur, tell us what you will find there.