Um - well, at least I managed to get something uploaded. If you click on the above small image it does come up bigger. Better than nowt I guess.
Anyway - some detail. This is the restriction in Far Sump first passed by Tim Nixon and Jerry Murland 35+ years ago, looking upstream. The floor is mobile gravel and the slope continues steeply up leftwards for several metres out of shot. (Ignore the obvious lines visible in this picture - these are part of a much more recent bypass route.)
As you can see there are no line belays (where it matters) to hold the line in the right place. Immediately on passing this restriction the way on is steeply down to the right (through another low slot). So the line buries itself in the gravel on the corner (to lower right in this image).
This picture was taken on a day when the restriction was too small to get through - the hole is body sized so there's not enough room if you're wearing tanks. So if you start digging to make it bigger, more and more gravel slumps in from the left. It's a potentially nasty place. When Tim and Jerry pushed this it was extremely rare to tackle this sort of obstacle underwater. They were really going into new (psychological) territory. Of course, once they showed it was possible it then became easy for the rest of us who followed. This was the real "breakthrough" at Far Sump.