Went down three times in the Seventies and I don't recall seeing any of that crap in the cave. The only thing we saw was Pooh's diving line tying up a couple of boulders and then disappearing under a pile of them! We were there not long after the ULSA lads were trapped.
We dug out the boulders, following the line, and got through eventually.
Total time first trip was over 16 hours! Last time was a more respectable 9 or 10. That's probably the time to expect if you go down - it's a big trip.