I miss understood the water diversion situation. The water is actually diverted from above the entrance taking it away to the huge shakehole to the West with the big dig in the bottom. This has considerably reduced the surface water intake to Quaking Pot.
It is clearly nothing to do with YDNP path repairs.
The work has been done by an excavator.
I see no need for cavers to divert water to a long abandoned dig site. Diggers in Quaking are unlikely to go to such lengths. So who are the parties that may have motive to do this. I am not permitted to speculate for professional reasons.

I am hols at the moment so I cant consult the NCC journal with the dye tracing info.
If the water levels are managed like this it could come down a grade to 4.

Very distressing for anyone who has had an epic on a previous trip.
The dead sheep is still in decent condition and would pull out on a rope if anyone fancied having a go. Another week and a body bag would be advisable.